├── .github
    └── workflows
    │   └── backend-sanity-checks.yml
├── .gitignore
├── README.md
├── excalidraw
    ├── final-iteration.png
    ├── iteration-1.excalidraw
    ├── iteration-2.excalidraw
    ├── iteration-3.excalidraw
    ├── iteration-4.excalidraw
    ├── iteration-5.excalidraw
    └── read-chunk.excalidraw
├── go.mod
├── go.sum
├── main.go
├── main_test.go
├── profiles
    ├── cpu-100-buf.prof
    ├── cpu-100-invert.prof
    ├── cpu-1000-invert.prof
    ├── cpu-10000-buf.prof
    ├── cpu-50-buf.prof
    ├── cpu-chunk-less-gc.prof
    ├── cpu-custom-parser.prof
    ├── cpu-int64.prof
    ├── cpu-less-access.prof
    ├── cpu-map.prof
    ├── cpu-parallel.prof
    ├── cpu-preprocess.prof
    ├── cpu-read-chunk-2.prof
    ├── cpu-read-chunk.prof
    ├── cpu-remove-builder.prof
    ├── cpu-remove-concatenation.prof
    ├── cpu.prof
    ├── cpu1.prof
    ├── cpu2.prof
    ├── cpu3.prof
    ├── cpu4.prof
    ├── cpu5.prof
    ├── mem-100-buf.prof
    ├── mem-100-invert.prof
    ├── mem-1000-invert.prof
    ├── mem-10000-buf.prof
    ├── mem-50-buf.prof
    ├── mem-chunk-less-gc.prof
    ├── mem.prof
    ├── mem1.prof
    ├── mem2.prof
    ├── mem3.prof
    ├── mem4.prof
    └── mem5.prof
└── test_cases
    ├── measurements-1.out
    ├── measurements-1.txt
    ├── measurements-10.out
    ├── measurements-10.txt
    ├── measurements-10000-unique-keys.out
    ├── measurements-10000-unique-keys.txt
    ├── measurements-2.out
    ├── measurements-2.txt
    ├── measurements-20.out
    ├── measurements-20.txt
    ├── measurements-3.out
    ├── measurements-3.txt
    ├── measurements-boundaries.out
    ├── measurements-boundaries.txt
    ├── measurements-complex-utf8.out
    ├── measurements-complex-utf8.txt
    ├── measurements-dot.out
    ├── measurements-dot.txt
    ├── measurements-rounding.out
    ├── measurements-rounding.txt
    ├── measurements-short.out
    ├── measurements-short.txt
    ├── measurements-shortest.out
    └── measurements-shortest.txt


/.github/workflows/backend-sanity-checks.yml:
--------------------------------------------------------------------------------
 1 | name: backend-sanity-checks
 2 | on:
 3 |   push:
 4 |     paths:
 5 |       - "**.go"
 6 |       - ".github/workflows/backend-sanity-checks.yml"
 7 | 
 8 | jobs:
 9 |   go-vet:
10 |     name: Go Vet
11 |     runs-on: ubuntu-latest
12 |     steps:
13 |       - uses: actions/checkout@v4
14 |       - name: Setup Go
15 |         uses: actions/setup-go@v4
16 |         with:
17 |           go-version: "1.21.x"
18 |       - name: Run go vet
19 |         run: go vet ./... > govetresult.json
20 |       - name: Upload Go test results
21 |         uses: actions/upload-artifact@v3
22 |         with:
23 |           name: go-vet-results
24 |           path: govetresult.json
25 |   go-fmt:
26 |     name: Go fmt
27 |     runs-on: ubuntu-latest
28 |     steps:
29 |       - uses: actions/checkout@v4
30 |       - name: Setup Go
31 |         uses: actions/setup-go@v4
32 |         with:
33 |           go-version: "1.21.x"
34 |       - name: Run go fmt
35 |         id: run-go-fmt
36 |         run: |
37 |           go fmt ./... >> gofmtresult.json
38 |           # [ -s <filename> ] returns true is file exists and size is greater than zero
39 |           echo "gofmt_needed=$(if [ -s gofmtresult.json ];then echo "true"; else echo "false"; fi)" >> $GITHUB_OUTPUT
40 |       - name: Check if any files need to be formatted with go fmt
41 |         if: steps.run-go-fmt.outputs.gofmt_needed == 'true'
42 |         run: |
43 |           echo "go fmt needs to be run on the following files:"
44 |           cat gofmtresult.json
45 |           exit 1
46 |   go-test:
47 |     name: Go Tests
48 |     runs-on: ubuntu-latest
49 |     steps:
50 |       - uses: actions/checkout@v4
51 |       - name: Setup Go
52 |         uses: actions/setup-go@v4
53 |         with:
54 |           go-version: "1.21.x"
55 |       - name: Install dependencies
56 |         run: |
57 |           go install gotest.tools/gotestsum@latest
58 |       - name: Run Tests
59 |         run: gotestsum --format testname --jsonfile testresult.json -- -v ./...
60 |       - name: Upload Go test results
61 |         uses: actions/upload-artifact@v3
62 |         with:
63 |           name: go-test-results
64 |           path: testresult.json
65 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | measurements.txt
2 | measurements.out
3 | trace*
4 | .DS_store


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # 1BRC
 2 | 
 3 | 1️⃣🐝🏎️ [The One Billion Row Challenge](https://github.com/gunnarmorling/1brc) -- A fun exploration of how quickly 1B rows from a text file can be aggregated. The challenge was primarily foces on Java but I decided to solve it in Golang! 
 4 | 
 5 | I wrote a detailed blog about my implementation approach, you can check it out [here](https://www.bytesizego.com/blog/one-billion-row-challenge-go). 
 6 | ## Record of iterations
 7 | 
 8 | Final implementation approach looks like this: 
 9 | 
10 | ![final iteration visualised](/excalidraw/final-iteration.png)
11 | 
12 | Here is a more detailed record of each individual iteration:
13 | 
14 | | Attempt Number | Approach | Execution Time | Diff | Commit |
15 | |-----------------|---|---|---|--|
16 | |0| Naive Implementation: Read temperatures into a map of cities. Iterate serially over each key (city) in map to find min, max and average temperatures.| 6:13.15 | || 
17 | |1| Evaluate each city in map concurrently using goroutines.|4:32.80|-100.35| [8bd5f43](https://github.com/shraddhaag/1brc/commit/8bd5f437e8cc231e3ee18348b83f4dc694137546)|
18 | |2|Remove sorting float64 slices. Calculate min, max and average by iterating.|4:25.59|-7.21|[830e5df](https://github.com/shraddhaag/1brc/commit/830e5dfacff9fb7a41d12027e21399736bc34701)|
19 | |3|Decouple reading and processing of file content. A buffered goroutine is used to communicate between the two processes.|5:22.83|+57.24|[2babf7d](https://github.com/shraddhaag/1brc/commit/2babf7dda72d92c72722b220b8b663e747075bd7)|
20 | |4|Instead of sending each line to the channel, now sending 100 lines chunked together. Also, to minimise garbage collection, not freeing up memory when resetting a slice. |3:41.76|-161.07|[b7b1781](https://github.com/shraddhaag/1brc/commit/b7b1781f58fd258a06940bd6c05eb404c8a14af6)|
21 | |5|Read file in chunks of 100 MB instead of reading line by line. |3:32.62|-9.14|[c26fea4](https://github.com/shraddhaag/1brc/commit/c26fea40019552a7e4fc1c864236f433b1b686f0)|
22 | |6|Convert temperature from `string` to `int64`, process in `int64` and convert to `float64` at the end. |2:51.50|-41.14|[7812da4](https://github.com/shraddhaag/1brc/commit/7812da4d0be07dd4686d5f9b9df1e93b08cd0dd1)|
23 | |7|In the city <> temperatures map, replaced the value for each key (city) to preprocessed min, max, count and sum of all temperatures instead of storing all recorded temperatures for the city.|1:39.81|-71.79|[e5213a8](https://github.com/shraddhaag/1brc/commit/e5213a836b17bec0a858474a11f07c902e724bba)|
24 | |8|Use producer consumer pattern to read file in chunks and process the chunks in parallel.|1:43.82|+14.01|[067f2a4](https://github.com/shraddhaag/1brc/commit/067f2a44c0d6b3bb7cc073639364f733bce09e3e)|
25 | |9|Reduce memory allocation by processing each read chunk into a map. Result channel now can collate the smaller processed chunk maps.|0:28.544|-75.286|[d4153ac](https://github.com/shraddhaag/1brc/commit/d4153ac7a841170a5ceee47d930e97738b5a19f6)|
26 | |10|Avoid string concatenation overhead by not reading the decimal point when processing city temperature.|0:24.571|-3.973|[90f2fe1](https://github.com/shraddhaag/1brc/commit/90f2fe121f454f3f1b5cdaeaaebe639bb86d4578)|
27 | |11|Convert byte slice to string directly instead of using a `strings.Builder`.|0:18.910|-5.761|[88bb6da](https://github.com/shraddhaag/1brc/commit/88bb6da8b85424d46a8c836f3c35a49466df1ea4)|
28 | |12|Replace `strconv.ParseInt` with a custom `string` to `int` parser.|0:14.008|-4.902|[17d575f](https://github.com/shraddhaag/1brc/commit/17d575fd0f143aed18d285713d030a5b52b478df)|
29 | |13|Reduce map access calls when constructing final result string.|0:12.017|-1.9991||


--------------------------------------------------------------------------------
/excalidraw/final-iteration.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/shraddhaag/1brc/8513d5e70a1bfabbf46ab86a9cb6558bc9805154/excalidraw/final-iteration.png


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392 |       "strokeStyle": "dashed",
393 |       "roughness": 0,
394 |       "opacity": 100,
395 |       "angle": 0,
396 |       "x": 879.2265625,
397 |       "y": 429.8671875,
398 |       "strokeColor": "#1e1e1e",
399 |       "backgroundColor": "#b2f2bb",
400 |       "width": 2.16015625,
401 |       "height": 87.23828125,
402 |       "seed": 2073783304,
403 |       "groupIds": [],
404 |       "frameId": null,
405 |       "roundness": null,
406 |       "boundElements": [],
407 |       "updated": 1707879746251,
408 |       "link": null,
409 |       "locked": false,
410 |       "startBinding": null,
411 |       "endBinding": null,
412 |       "lastCommittedPoint": null,
413 |       "startArrowhead": null,
414 |       "endArrowhead": null,
415 |       "points": [
416 |         [
417 |           0,
418 |           0
419 |         ],
420 |         [
421 |           2.16015625,
422 |           87.23828125
423 |         ]
424 |       ]
425 |     },
426 |     {
427 |       "type": "text",
428 |       "version": 669,
429 |       "versionNonce": 2011823480,
430 |       "isDeleted": false,
431 |       "id": "T0H5NemUZtNj_nHhoUhx2",
432 |       "fillStyle": "cross-hatch",
433 |       "strokeWidth": 1,
434 |       "strokeStyle": "dashed",
435 |       "roughness": 0,
436 |       "opacity": 100,
437 |       "angle": 0,
438 |       "x": 811.2734375,
439 |       "y": 565.1203125,
440 |       "strokeColor": "#1e1e1e",
441 |       "backgroundColor": "#b2f2bb",
442 |       "width": 412.5,
443 |       "height": 57.599999999999994,
444 |       "seed": 1203990280,
445 |       "groupIds": [],
446 |       "frameId": null,
447 |       "roundness": null,
448 |       "boundElements": [
449 |         {
450 |           "id": "-xsPzlYPZgcBwgBkIlbz_",
451 |           "type": "arrow"
452 |         }
453 |       ],
454 |       "updated": 1707879837005,
455 |       "link": null,
456 |       "locked": false,
457 |       "fontSize": 16,
458 |       "fontFamily": 3,
459 |       "text": "option 2: send sliced chunk to channel \nupto last occurrence of '\\n'. The remaining \nslice is sent with the next chunk read.",
460 |       "textAlign": "left",
461 |       "verticalAlign": "top",
462 |       "containerId": null,
463 |       "originalText": "option 2: send sliced chunk to channel \nupto last occurrence of '\\n'. The remaining \nslice is sent with the next chunk read.",
464 |       "lineHeight": 1.2,
465 |       "baseline": 53
466 |     },
467 |     {
468 |       "type": "text",
469 |       "version": 879,
470 |       "versionNonce": 213103736,
471 |       "isDeleted": false,
472 |       "id": "Go35gWYZMYWl3goK_rHtr",
473 |       "fillStyle": "cross-hatch",
474 |       "strokeWidth": 1,
475 |       "strokeStyle": "dashed",
476 |       "roughness": 0,
477 |       "opacity": 100,
478 |       "angle": 0,
479 |       "x": 901.3301391601562,
480 |       "y": 468.975,
481 |       "strokeColor": "#1e1e1e",
482 |       "backgroundColor": "#b2f2bb",
483 |       "width": 431.25,
484 |       "height": 38.4,
485 |       "seed": 1200362616,
486 |       "groupIds": [],
487 |       "frameId": null,
488 |       "roundness": null,
489 |       "boundElements": [],
490 |       "updated": 1707879777437,
491 |       "link": null,
492 |       "locked": false,
493 |       "fontSize": 16,
494 |       "fontFamily": 3,
495 |       "text": "option 1: read from file again till next '\\n' \nand send extended chunk on channel.",
496 |       "textAlign": "left",
497 |       "verticalAlign": "top",
498 |       "containerId": null,
499 |       "originalText": "option 1: read from file again till next '\\n' \nand send extended chunk on channel.",
500 |       "lineHeight": 1.2,
501 |       "baseline": 34
502 |     },
503 |     {
504 |       "type": "arrow",
505 |       "version": 1043,
506 |       "versionNonce": 1572572792,
507 |       "isDeleted": false,
508 |       "id": "-xsPzlYPZgcBwgBkIlbz_",
509 |       "fillStyle": "cross-hatch",
510 |       "strokeWidth": 1,
511 |       "strokeStyle": "solid",
512 |       "roughness": 0,
513 |       "opacity": 100,
514 |       "angle": 0,
515 |       "x": 667.5,
516 |       "y": 579.6158573000139,
517 |       "strokeColor": "#1e1e1e",
518 |       "backgroundColor": "#b2f2bb",
519 |       "width": 128.95703125000045,
520 |       "height": 2.077126078293304,
521 |       "seed": 161678456,
522 |       "groupIds": [],
523 |       "frameId": null,
524 |       "roundness": null,
525 |       "boundElements": [],
526 |       "updated": 1707879837006,
527 |       "link": null,
528 |       "locked": false,
529 |       "startBinding": null,
530 |       "endBinding": {
531 |         "elementId": "T0H5NemUZtNj_nHhoUhx2",
532 |         "focus": 0.2698014259131479,
533 |         "gap": 14.816406249999773
534 |       },
535 |       "lastCommittedPoint": null,
536 |       "startArrowhead": null,
537 |       "endArrowhead": "arrow",
538 |       "points": [
539 |         [
540 |           0,
541 |           0
542 |         ],
543 |         [
544 |           128.95703125000045,
545 |           2.077126078293304
546 |         ]
547 |       ]
548 |     },
549 |     {
550 |       "type": "arrow",
551 |       "version": 1397,
552 |       "versionNonce": 208890632,
553 |       "isDeleted": false,
554 |       "id": "Uy-8k8MTLHSEjEcrUCBhT",
555 |       "fillStyle": "cross-hatch",
556 |       "strokeWidth": 1,
557 |       "strokeStyle": "solid",
558 |       "roughness": 0,
559 |       "opacity": 100,
560 |       "angle": 0,
561 |       "x": 523.07421875,
562 |       "y": 487.49359693918916,
563 |       "strokeColor": "#1e1e1e",
564 |       "backgroundColor": "#b2f2bb",
565 |       "width": 115.6171875,
566 |       "height": 0.38031568918916037,
567 |       "seed": 132209528,
568 |       "groupIds": [],
569 |       "frameId": null,
570 |       "roundness": null,
571 |       "boundElements": [],
572 |       "updated": 1707879642551,
573 |       "link": null,
574 |       "locked": false,
575 |       "startBinding": null,
576 |       "endBinding": null,
577 |       "lastCommittedPoint": null,
578 |       "startArrowhead": null,
579 |       "endArrowhead": "arrow",
580 |       "points": [
581 |         [
582 |           0,
583 |           0
584 |         ],
585 |         [
586 |           -115.6171875,
587 |           -0.38031568918916037
588 |         ]
589 |       ]
590 |     },
591 |     {
592 |       "type": "arrow",
593 |       "version": 1696,
594 |       "versionNonce": 1666213496,
595 |       "isDeleted": false,
596 |       "id": "WwP5qFomcnIYtctxg-q4m",
597 |       "fillStyle": "cross-hatch",
598 |       "strokeWidth": 1,
599 |       "strokeStyle": "solid",
600 |       "roughness": 0,
601 |       "opacity": 100,
602 |       "angle": 0,
603 |       "x": 667.62890625,
604 |       "y": 579.6117136707484,
605 |       "strokeColor": "#1e1e1e",
606 |       "backgroundColor": "#b2f2bb",
607 |       "width": 259.46484375,
608 |       "height": 0.7098472346569906,
609 |       "seed": 1477918728,
610 |       "groupIds": [],
611 |       "frameId": null,
612 |       "roundness": null,
613 |       "boundElements": [],
614 |       "updated": 1707879590394,
615 |       "link": null,
616 |       "locked": false,
617 |       "startBinding": null,
618 |       "endBinding": null,
619 |       "lastCommittedPoint": null,
620 |       "startArrowhead": null,
621 |       "endArrowhead": "arrow",
622 |       "points": [
623 |         [
624 |           0,
625 |           0
626 |         ],
627 |         [
628 |           -259.46484375,
629 |           0.7098472346569906
630 |         ]
631 |       ]
632 |     }
633 |   ],
634 |   "appState": {
635 |     "gridSize": null,
636 |     "viewBackgroundColor": "#ffffff"
637 |   },
638 |   "files": {}
639 | }


--------------------------------------------------------------------------------
/go.mod:
--------------------------------------------------------------------------------
 1 | module github.com/shraddhaag/1brc-go
 2 | 
 3 | go 1.21
 4 | 
 5 | require (
 6 | 	github.com/davecgh/go-spew v1.1.1 // indirect
 7 | 	github.com/pmezard/go-difflib v1.0.0 // indirect
 8 | 	github.com/stretchr/testify v1.8.4 // indirect
 9 | 	gopkg.in/yaml.v3 v3.0.1 // indirect
10 | )
11 | 


--------------------------------------------------------------------------------
/go.sum:
--------------------------------------------------------------------------------
 1 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 2 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 3 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 4 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 5 | github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 6 | github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 7 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 8 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 9 | gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
10 | 


--------------------------------------------------------------------------------
/main.go:
--------------------------------------------------------------------------------
  1 | package main
  2 | 
  3 | import (
  4 | 	"bytes"
  5 | 	"errors"
  6 | 	"flag"
  7 | 	"fmt"
  8 | 	"io"
  9 | 	"log"
 10 | 	"math"
 11 | 	"os"
 12 | 	"runtime"
 13 | 	"runtime/pprof"
 14 | 	"runtime/trace"
 15 | 	"sort"
 16 | 	"strings"
 17 | 	"sync"
 18 | )
 19 | 
 20 | var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
 21 | var memprofile = flag.String("memprofile", "", "write memory profile to `file`")
 22 | var executionprofile = flag.String("execprofile", "", "write tarce execution to `file`")
 23 | var input = flag.String("input", "", "path to the input file to evaluate")
 24 | 
 25 | func main() {
 26 | 
 27 | 	flag.Parse()
 28 | 
 29 | 	if *executionprofile != "" {
 30 | 		f, err := os.Create("./profiles/" + *executionprofile)
 31 | 		if err != nil {
 32 | 			log.Fatal("could not create trace execution profile: ", err)
 33 | 		}
 34 | 		defer f.Close()
 35 | 		trace.Start(f)
 36 | 		defer trace.Stop()
 37 | 	}
 38 | 
 39 | 	if *cpuprofile != "" {
 40 | 		f, err := os.Create("./profiles/" + *cpuprofile)
 41 | 		if err != nil {
 42 | 			log.Fatal("could not create CPU profile: ", err)
 43 | 		}
 44 | 		defer f.Close()
 45 | 		if err := pprof.StartCPUProfile(f); err != nil {
 46 | 			log.Fatal("could not start CPU profile: ", err)
 47 | 		}
 48 | 		defer pprof.StopCPUProfile()
 49 | 	}
 50 | 
 51 | 	evaluate(*input)
 52 | 
 53 | 	if *memprofile != "" {
 54 | 		f, err := os.Create("./profiles/" + *memprofile)
 55 | 		if err != nil {
 56 | 			log.Fatal("could not create memory profile: ", err)
 57 | 		}
 58 | 		defer f.Close()
 59 | 		runtime.GC()
 60 | 		if err := pprof.WriteHeapProfile(f); err != nil {
 61 | 			log.Fatal("could not write memory profile: ", err)
 62 | 		}
 63 | 	}
 64 | }
 65 | 
 66 | type computedResult struct {
 67 | 	city          string
 68 | 	min, max, avg float64
 69 | }
 70 | 
 71 | func evaluate(input string) string {
 72 | 	mapOfTemp, err := readFileLineByLineIntoAMap(input)
 73 | 	if err != nil {
 74 | 		panic(err)
 75 | 	}
 76 | 
 77 | 	resultArr := make([]computedResult, len(mapOfTemp))
 78 | 	var count int
 79 | 	for city, calculated := range mapOfTemp {
 80 | 		resultArr[count] = computedResult{
 81 | 			city: city,
 82 | 			min:  round(float64(calculated.min) / 10.0),
 83 | 			max:  round(float64(calculated.max) / 10.0),
 84 | 			avg:  round(float64(calculated.sum) / 10.0 / float64(calculated.count)),
 85 | 		}
 86 | 		count++
 87 | 	}
 88 | 
 89 | 	sort.Slice(resultArr, func(i, j int) bool {
 90 | 		return resultArr[i].city < resultArr[j].city
 91 | 	})
 92 | 
 93 | 	var stringsBuilder strings.Builder
 94 | 	for _, i := range resultArr {
 95 | 		stringsBuilder.WriteString(fmt.Sprintf("%s=%.1f/%.1f/%.1f, ", i.city, i.min, i.avg, i.max))
 96 | 	}
 97 | 	return stringsBuilder.String()[:stringsBuilder.Len()-2]
 98 | }
 99 | 
100 | type cityTemperatureInfo struct {
101 | 	count int64
102 | 	min   int64
103 | 	max   int64
104 | 	sum   int64
105 | }
106 | 
107 | func readFileLineByLineIntoAMap(filepath string) (map[string]cityTemperatureInfo, error) {
108 | 	file, err := os.Open(filepath)
109 | 	if err != nil {
110 | 		panic(err)
111 | 	}
112 | 	defer file.Close()
113 | 
114 | 	mapOfTemp := make(map[string]cityTemperatureInfo)
115 | 	resultStream := make(chan map[string]cityTemperatureInfo, 10)
116 | 	chunkStream := make(chan []byte, 15)
117 | 	chunkSize := 64 * 1024 * 1024
118 | 	var wg sync.WaitGroup
119 | 
120 | 	// spawn workers to consume (process) file chunks read
121 | 	for i := 0; i < runtime.NumCPU()-1; i++ {
122 | 		wg.Add(1)
123 | 		go func() {
124 | 			for chunk := range chunkStream {
125 | 				processReadChunk(chunk, resultStream)
126 | 			}
127 | 			wg.Done()
128 | 		}()
129 | 	}
130 | 
131 | 	// spawn a goroutine to read file in chunks and send it to the chunk channel for further processing
132 | 	go func() {
133 | 		buf := make([]byte, chunkSize)
134 | 		leftover := make([]byte, 0, chunkSize)
135 | 		for {
136 | 			readTotal, err := file.Read(buf)
137 | 			if err != nil {
138 | 				if errors.Is(err, io.EOF) {
139 | 					break
140 | 				}
141 | 				panic(err)
142 | 			}
143 | 			buf = buf[:readTotal]
144 | 
145 | 			toSend := make([]byte, readTotal)
146 | 			copy(toSend, buf)
147 | 
148 | 			lastNewLineIndex := bytes.LastIndex(buf, []byte{'\n'})
149 | 
150 | 			toSend = append(leftover, buf[:lastNewLineIndex+1]...)
151 | 			leftover = make([]byte, len(buf[lastNewLineIndex+1:]))
152 | 			copy(leftover, buf[lastNewLineIndex+1:])
153 | 
154 | 			chunkStream <- toSend
155 | 
156 | 		}
157 | 		close(chunkStream)
158 | 
159 | 		// wait for all chunks to be proccessed before closing the result stream
160 | 		wg.Wait()
161 | 		close(resultStream)
162 | 	}()
163 | 
164 | 	// process all city temperatures derived after processing the file chunks
165 | 	for t := range resultStream {
166 | 		for city, tempInfo := range t {
167 | 			if val, ok := mapOfTemp[city]; ok {
168 | 				val.count += tempInfo.count
169 | 				val.sum += tempInfo.sum
170 | 				if tempInfo.min < val.min {
171 | 					val.min = tempInfo.min
172 | 				}
173 | 
174 | 				if tempInfo.max > val.max {
175 | 					val.max = tempInfo.max
176 | 				}
177 | 				mapOfTemp[city] = val
178 | 			} else {
179 | 				mapOfTemp[city] = tempInfo
180 | 			}
181 | 		}
182 | 	}
183 | 
184 | 	return mapOfTemp, nil
185 | }
186 | 
187 | func processReadChunk(buf []byte, resultStream chan<- map[string]cityTemperatureInfo) {
188 | 	toSend := make(map[string]cityTemperatureInfo)
189 | 	var start int
190 | 	var city string
191 | 
192 | 	stringBuf := string(buf)
193 | 	for index, char := range stringBuf {
194 | 		switch char {
195 | 		case ';':
196 | 			city = stringBuf[start:index]
197 | 			start = index + 1
198 | 		case '\n':
199 | 			if (index-start) > 1 && len(city) != 0 {
200 | 				temp := customStringToIntParser(stringBuf[start:index])
201 | 				start = index + 1
202 | 
203 | 				if val, ok := toSend[city]; ok {
204 | 					val.count++
205 | 					val.sum += temp
206 | 					if temp < val.min {
207 | 						val.min = temp
208 | 					}
209 | 
210 | 					if temp > val.max {
211 | 						val.max = temp
212 | 					}
213 | 					toSend[city] = val
214 | 				} else {
215 | 					toSend[city] = cityTemperatureInfo{
216 | 						count: 1,
217 | 						min:   temp,
218 | 						max:   temp,
219 | 						sum:   temp,
220 | 					}
221 | 				}
222 | 
223 | 				city = ""
224 | 			}
225 | 		}
226 | 	}
227 | 	resultStream <- toSend
228 | }
229 | 
230 | func round(x float64) float64 {
231 | 	rounded := math.Round(x * 10)
232 | 	if rounded == -0.0 {
233 | 		return 0.0
234 | 	}
235 | 	return rounded / 10
236 | }
237 | 
238 | // input: string containing signed number in the range [-99.9, 99.9]
239 | // output: signed int in the range [-999, 999]
240 | func customStringToIntParser(input string) (output int64) {
241 | 	var isNegativeNumber bool
242 | 	if input[0] == '-' {
243 | 		isNegativeNumber = true
244 | 		input = input[1:]
245 | 	}
246 | 
247 | 	switch len(input) {
248 | 	case 3:
249 | 		output = int64(input[0])*10 + int64(input[2]) - int64('0')*11
250 | 	case 4:
251 | 		output = int64(input[0])*100 + int64(input[1])*10 + int64(input[3]) - (int64('0') * 111)
252 | 	}
253 | 
254 | 	if isNegativeNumber {
255 | 		return -output
256 | 	}
257 | 	return
258 | }
259 | 


--------------------------------------------------------------------------------
/main_test.go:
--------------------------------------------------------------------------------
 1 | package main
 2 | 
 3 | import (
 4 | 	"io/fs"
 5 | 	"os"
 6 | 	"path/filepath"
 7 | 	"testing"
 8 | 
 9 | 	"github.com/stretchr/testify/assert"
10 | )
11 | 
12 | func TestMain(t *testing.T) {
13 | 
14 | 	inputFiles := find("./test_cases", ".txt")
15 | 	for _, test := range inputFiles {
16 | 		t.Run(test, func(t *testing.T) {
17 | 			output := evaluate(test + ".txt")
18 | 			assert.Equal(t, readFile(test+".out"), "{"+output+"}\n")
19 | 		})
20 | 	}
21 | }
22 | 
23 | func readFile(input string) string {
24 | 	fileContent, err := os.ReadFile(input)
25 | 	if err != nil {
26 | 		panic(err)
27 | 	}
28 | 	return string(fileContent)
29 | }
30 | 
31 | func find(root, ext string) []string {
32 | 	var a []string
33 | 	filepath.WalkDir(root, func(s string, d fs.DirEntry, e error) error {
34 | 		if e != nil {
35 | 			return e
36 | 		}
37 | 		if filepath.Ext(d.Name()) == ext {
38 | 			a = append(a, s[:len(s)-len(ext)])
39 | 		}
40 | 		return nil
41 | 	})
42 | 	return a
43 | }
44 | 


--------------------------------------------------------------------------------
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/test_cases/measurements-1.out:
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1 | {Kunming=19.8/19.8/19.8}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-1.txt:
--------------------------------------------------------------------------------
1 | Kunming;19.8
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-10.out:
--------------------------------------------------------------------------------
1 | {Adelaide=15.0/15.0/15.0, Cabo San Lucas=14.9/14.9/14.9, Dodoma=22.2/22.2/22.2, Halifax=12.9/12.9/12.9, Karachi=15.4/15.4/15.4, Pittsburgh=9.7/9.7/9.7, Ségou=25.7/25.7/25.7, Tauranga=38.2/38.2/38.2, Xi'an=24.2/24.2/24.2, Zagreb=12.2/12.2/12.2}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-10.txt:
--------------------------------------------------------------------------------
 1 | Halifax;12.9
 2 | Zagreb;12.2
 3 | Cabo San Lucas;14.9
 4 | Adelaide;15.0
 5 | Ségou;25.7
 6 | Pittsburgh;9.7
 7 | Karachi;15.4
 8 | Xi'an;24.2
 9 | Dodoma;22.2
10 | Tauranga;38.2
11 | 


--------------------------------------------------------------------------------
/test_cases/measurements-2.out:
--------------------------------------------------------------------------------
1 | {Bosaso=19.2/19.2/19.2, Petropavlovsk-Kamchatsky=9.5/9.5/9.5}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-2.txt:
--------------------------------------------------------------------------------
1 | Bosaso;19.2
2 | Petropavlovsk-Kamchatsky;9.5
3 | 


--------------------------------------------------------------------------------
/test_cases/measurements-20.out:
--------------------------------------------------------------------------------
1 | {Abéché1️⃣🐝🏎️=27.3/27.3/27.3, Almaty1️⃣🐝🏎️=15.3/15.3/15.3, Baghdad1️⃣🐝🏎️=26.0/26.0/26.0, Bangkok1️⃣🐝🏎️=25.6/25.6/25.6, Berlin1️⃣🐝🏎️=-0.3/-0.3/-0.3, Birao1️⃣🐝🏎️=33.5/33.5/33.5, Canberra1️⃣🐝🏎️=5.2/5.2/5.2, Chittagong1️⃣🐝🏎️=12.6/12.6/12.6, Da Nang1️⃣🐝🏎️=33.7/33.7/33.7, Edinburgh1️⃣🐝🏎️=19.8/19.8/19.8, Irkutsk1️⃣🐝🏎️=9.9/9.9/9.9, Lhasa1️⃣🐝🏎️=13.4/13.4/13.4, Lyon1️⃣🐝🏎️=1.8/1.8/1.8, Mogadishu1️⃣🐝🏎️=11.5/11.5/11.5, Nashville1️⃣🐝🏎️=-4.9/-4.9/-4.9, Odesa1️⃣🐝🏎️=6.5/6.5/6.5, Parakou1️⃣🐝🏎️=36.3/36.3/36.3, Tamanrasset1️⃣🐝🏎️=17.9/17.9/17.9, Tirana1️⃣🐝🏎️=27.7/27.7/27.7, Xi'an1️⃣🐝🏎️=17.5/17.5/17.5}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-20.txt:
--------------------------------------------------------------------------------
 1 | Odesa1️⃣🐝🏎️;6.5
 2 | Canberra1️⃣🐝🏎️;5.2
 3 | Lhasa1️⃣🐝🏎️;13.4
 4 | Edinburgh1️⃣🐝🏎️;19.8
 5 | Da Nang1️⃣🐝🏎️;33.7
 6 | Xi'an1️⃣🐝🏎️;17.5
 7 | Berlin1️⃣🐝🏎️;-0.3
 8 | Tamanrasset1️⃣🐝🏎️;17.9
 9 | Abéché1️⃣🐝🏎️;27.3
10 | Baghdad1️⃣🐝🏎️;26.0
11 | Lyon1️⃣🐝🏎️;1.8
12 | Mogadishu1️⃣🐝🏎️;11.5
13 | Bangkok1️⃣🐝🏎️;25.6
14 | Irkutsk1️⃣🐝🏎️;9.9
15 | Parakou1️⃣🐝🏎️;36.3
16 | Almaty1️⃣🐝🏎️;15.3
17 | Birao1️⃣🐝🏎️;33.5
18 | Chittagong1️⃣🐝🏎️;12.6
19 | Tirana1️⃣🐝🏎️;27.7
20 | Nashville1️⃣🐝🏎️;-4.9
21 | 


--------------------------------------------------------------------------------
/test_cases/measurements-3.out:
--------------------------------------------------------------------------------
1 | {Bosaso=-15.0/1.3/20.0, Petropavlovsk-Kamchatsky=-9.5/0.0/9.5}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-3.txt:
--------------------------------------------------------------------------------
1 | Bosaso;5.0
2 | Bosaso;20.0
3 | Bosaso;-5.0
4 | Bosaso;-15.0
5 | Petropavlovsk-Kamchatsky;9.5
6 | Petropavlovsk-Kamchatsky;-9.5
7 | 


--------------------------------------------------------------------------------
/test_cases/measurements-boundaries.out:
--------------------------------------------------------------------------------
1 | {Bosaso=-99.9/-99.9/-99.9, Petropavlovsk-Kamchatsky=99.9/99.9/99.9}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-boundaries.txt:
--------------------------------------------------------------------------------
1 | Bosaso;-99.9
2 | Petropavlovsk-Kamchatsky;99.9
3 | 


--------------------------------------------------------------------------------
/test_cases/measurements-complex-utf8.out:
--------------------------------------------------------------------------------
1 | {B=8.9/8.9/8.9, C=38.9/38.9/38.9, CabindaKermānZunhuaRochesterValenzuelaOrūmīyehWugangShuangqiaoTshikapa=3.0/3.0/3.0, ChesterLobnyaSan LeandroHemeiSolweziGrand BourgKaliboS=23.4/23.4/23.4, MirnaPehčevoRopažiGus=16.7/16.7/16.7, PototanSahuayo de MorelosBambergMosigkauFrancisco BeltrãoJelenia GóraTelêmaco Borb=17.5/17.5/17.5, TanjungpinangKasselHaldiaLuxorLạng SơnAt TājīTaraka=10.6/10.6/10.6, aniCartagoEṭ ṬīraTemerinCormeilles-en-ParisisZawyat ech CheïkhS=25.4/25.4/25.4, burgazAl ḨawīyahSalamancaMbanza KongoNchelengeZhangaözenTurbatMatiMangghystaūMalak=21.5/21.5/21.5, cotánSan Ramón de la Nueva OránWausauGbaweTailaiRochester HillsVilla ElisaToba TekS=11.2/11.2/11.2, eLafayetteAsh Shaţ=14.2/14.2/14.2, en IslandKota BharuCiudad López MateosCelayaVinhDuyunLos Mochis‘AjmānNyalaLarkanaWichitaNishi=11.9/11.9/11.9, epé=28.2/28.2/28.2, hanVarkkallaiPort LokoD=10.9/10.9/10.9, iCoahuitlánRabatJahāngīrpur SālkhaniCamUniversity of California-Santa BarbaraSerravalleTelkathuM=13.4/13.4/13.4, igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkomunGornji PetrovciRibnicaKon TumŠavnikPoul=22.5/22.5/22.5, igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkopunGornji PetrovciRibnicaKon TumŠavnikPodl=11.5/11.5/11.5, igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkopunGornji PetrovciRibnicaKon TumŠavnikPoul=18.5/18.5/18.5, inhoSökeDordrechtPoáLaloG=13.1/13.1/13.1, iudad Melchor MúzquizQuinhámelDa=40.5/40.5/40.5, ixButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkomunGornji PetrovciRibnicaKon TumŠavnikPoul=0.1/0.1/0.1, l ‘=14.6/14.6/14.6, lhuleuTacurongNavapolatskPiscoDera Ismail KhanLabéAltamiraCavite CityYevpatoriiaTait=22.8/22.8/22.8, liLoretoPlacentiaAliso ViejoChomaPen-y-Bont ar OgwrCojutepeque=12.4/12.4/12.4, lioúpoliBarahonaHoPhuketLe BardoBuena ParkKayesChampigny-sur-MarneHaskovoChathamBatleyEsteioRe=22.5/22.5/22.5, m el Bo=14.6/14.6/14.6, mazunchaleZrenjaninFouchanaSurtPanč=6.7/6.7/6.7, ngoDübendorfC=11.7/11.7/11.7, nt-A=9.2/9.2/9.2, ntington StationKampong SpeuKakataMoschátoBressoVentspilsSaint-CloudTamboSidi Smai’ilDandenon=14.6/14.6/14.6, oCanagatanHelsinkiJabalpurProvidenceRuchengNizhniy NovgorodAhvāzJeparaShaoyangComayagüe=17.3/17.3/17.3, oGumlāSamā’=14.9/14.9/14.9, os Reyes de SalgadoCinisello BalsamoKashibaH=20.0/20.0/20.0, picuíbaJhang CityTepicJayapuraRio BrancoToyamaFangtingSanandajDelhi CantonmentLinghaiShorāpurToy=13.0/13.0/13.0, raKielSibuYatoParanáSanta ClaraYamagataKatihārBeykozImperat=13.5/13.5/13.5, rhamDera Ghazi KhanMiyazakiBhātpār=21.3/21.3/21.3, rugarhVerāvalAlagoinhasEdremitBandırmaSalavatGandajikaLucapaLeesburgTamaRas Tan=10.9/10.9/10.9, skişeh=12.9/12.9/12.9, venGaopingDunhuaAz Zarqā’SylhetKaihuaCaerdyddJāmnagarFuyuanGayaFlorianópolisC=1.9/1.9/1.9, y-le-MoutierSant’ArpinoPljevljaRo=0.8/0.8/0.8, ça PaulistaDarmstadtZhengdingPindamonhangabaEnschedeGirónUttarpāraHeidelbergK=6.0/6.0/6.0, üSosnowiecTanauanMya=18.4/18.4/18.4, ālSongnimSanto TomasKoiduHoshangābādOpoleNovocheboksarskArarasKhannaPunoKoforiduaAhmadpur E=19.4/19.4/19.4, āng=15.7/15.7/15.7, ġFis=9.6/9.6/9.6, ‘AqabahPembaNowgongQu=12.9/12.9/12.9}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-complex-utf8.txt:
--------------------------------------------------------------------------------
 1 | aniCartagoEṭ ṬīraTemerinCormeilles-en-ParisisZawyat ech CheïkhS;25.4
 2 | picuíbaJhang CityTepicJayapuraRio BrancoToyamaFangtingSanandajDelhi CantonmentLinghaiShorāpurToy;13.0
 3 | lhuleuTacurongNavapolatskPiscoDera Ismail KhanLabéAltamiraCavite CityYevpatoriiaTait;22.8
 4 | āng;15.7
 5 | hanVarkkallaiPort LokoD;10.9
 6 | eLafayetteAsh Shaţ;14.2
 7 | ‘AqabahPembaNowgongQu;12.9
 8 | inhoSökeDordrechtPoáLaloG;13.1
 9 | skişeh;12.9
10 | rhamDera Ghazi KhanMiyazakiBhātpār;21.3
11 | igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkopunGornji PetrovciRibnicaKon TumŠavnikPodl;11.5
12 | igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkopunGornji PetrovciRibnicaKon TumŠavnikPoul;18.5
13 | igButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkomunGornji PetrovciRibnicaKon TumŠavnikPoul;22.5
14 | ixButeboJuršinciKoaniImdinaNova VasDestrnikVarvarinSkomunGornji PetrovciRibnicaKon TumŠavnikPoul;0.1
15 | B;8.9
16 | C;38.9
17 | nt-A;9.2
18 | y-le-MoutierSant’ArpinoPljevljaRo;0.8
19 | oGumlāSamā’;14.9
20 | os Reyes de SalgadoCinisello BalsamoKashibaH;20.0
21 | m el Bo;14.6
22 | mazunchaleZrenjaninFouchanaSurtPanč;6.7
23 | ġFis;9.6
24 | epé;28.2
25 | ālSongnimSanto TomasKoiduHoshangābādOpoleNovocheboksarskArarasKhannaPunoKoforiduaAhmadpur E;19.4
26 | iudad Melchor MúzquizQuinhámelDa;40.5
27 | ChesterLobnyaSan LeandroHemeiSolweziGrand BourgKaliboS;23.4
28 | cotánSan Ramón de la Nueva OránWausauGbaweTailaiRochester HillsVilla ElisaToba TekS;11.2
29 | raKielSibuYatoParanáSanta ClaraYamagataKatihārBeykozImperat;13.5
30 | l ‘;14.6
31 | TanjungpinangKasselHaldiaLuxorLạng SơnAt TājīTaraka;10.6
32 | MirnaPehčevoRopažiGus;16.7
33 | üSosnowiecTanauanMya;18.4
34 | ngoDübendorfC;11.7
35 | liLoretoPlacentiaAliso ViejoChomaPen-y-Bont ar OgwrCojutepeque;12.4
36 | burgazAl ḨawīyahSalamancaMbanza KongoNchelengeZhangaözenTurbatMatiMangghystaūMalak;21.5
37 | iCoahuitlánRabatJahāngīrpur SālkhaniCamUniversity of California-Santa BarbaraSerravalleTelkathuM;13.4
38 | lioúpoliBarahonaHoPhuketLe BardoBuena ParkKayesChampigny-sur-MarneHaskovoChathamBatleyEsteioRe;22.5
39 | PototanSahuayo de MorelosBambergMosigkauFrancisco BeltrãoJelenia GóraTelêmaco Borb;17.5
40 | CabindaKermānZunhuaRochesterValenzuelaOrūmīyehWugangShuangqiaoTshikapa;3.0
41 | venGaopingDunhuaAz Zarqā’SylhetKaihuaCaerdyddJāmnagarFuyuanGayaFlorianópolisC;1.9
42 | ntington StationKampong SpeuKakataMoschátoBressoVentspilsSaint-CloudTamboSidi Smai’ilDandenon;14.6
43 | rugarhVerāvalAlagoinhasEdremitBandırmaSalavatGandajikaLucapaLeesburgTamaRas Tan;10.9
44 | oCanagatanHelsinkiJabalpurProvidenceRuchengNizhniy NovgorodAhvāzJeparaShaoyangComayagüe;17.3
45 | ça PaulistaDarmstadtZhengdingPindamonhangabaEnschedeGirónUttarpāraHeidelbergK;6.0
46 | en IslandKota BharuCiudad López MateosCelayaVinhDuyunLos Mochis‘AjmānNyalaLarkanaWichitaNishi;11.9
47 | 


--------------------------------------------------------------------------------
/test_cases/measurements-dot.out:
--------------------------------------------------------------------------------
1 | {-=1.0/1.5/2.0, .=1.0/1.0/1.0}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-dot.txt:
--------------------------------------------------------------------------------
1 | .;1.0
2 | -;1.0
3 | -;2.0
4 | 


--------------------------------------------------------------------------------
/test_cases/measurements-rounding.out:
--------------------------------------------------------------------------------
1 | {ham=14.6/25.5/33.6, jel=-9.0/18.0/46.5}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-short.out:
--------------------------------------------------------------------------------
1 | {a=1.0/1.0/1.0, b=1.0/1.5/2.0}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-short.txt:
--------------------------------------------------------------------------------
1 | a;1.0
2 | b;1.0
3 | b;2.0
4 | 


--------------------------------------------------------------------------------
/test_cases/measurements-shortest.out:
--------------------------------------------------------------------------------
1 | {a=1.0/1.0/1.0}
2 | 


--------------------------------------------------------------------------------
/test_cases/measurements-shortest.txt:
--------------------------------------------------------------------------------
1 | a;1.0
2 | 


--------------------------------------------------------------------------------