├── README.md ├── gpu_cmode.lua └── LICENSE /README.md: -------------------------------------------------------------------------------- 1 | # Slurm SPANK GPU Compute Mode plugin 2 | 3 | The GPU Compute mode [SPANK](https://slurm.schedmd.com/spank.html) plugin for 4 | [Slurm](https://slurm.schedmd.com/) allows users to choose the compute mode of 5 | GPUs they submit jobs to. 6 | 7 | ## Rationale 8 | 9 | NVIDIA GPUs can be set to operate under different compute modes: 10 | 11 | * `Default` (shared): Multiple host threads can use the device 12 | at the same time. 13 | * `Exclusive-process`: Only one CUDA context may be created on 14 | the device across all processes in the system. 15 | * `Prohibited`: No CUDA context can be created on the device. 16 | 17 | _More information is available in the [CUDA Programming 18 | guide](http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#compute-modes)_ 19 | 20 | 21 | To ensure optimal performance, process isolation and avoid situations where 22 | multiple processes unintentionally run on the same GPU, it's often recommended 23 | to set the GPU compute mode to `Exclusive-process`. 24 | 25 | Unfortunately, some legacy applications may require to run concurrent processes 26 | on a single GPU, to function properly, and thus need the GPUs to be set in the 27 | `Default` (_i.e._ shared) compute mode. 28 | 29 | Hence the need for a mechanism that would allow users to choose the compute 30 | mode of the GPUs their job will run on. 31 | 32 | 33 | ## Installation 34 | 35 | **Requirements**: 36 | * [`slurm-spank-lua`](https://github.com/stanford-rc/slurm-spank-lua) 37 | (submission and execution nodes) 38 | * [`nvidia-smi`](https://developer.nvidia.com/nvidia-system-management-interface) 39 | (execution nodes) 40 | 41 | The Slurm SPANK GPU Compute Mode plugin is written in [Lua](http://www.lua.org) 42 | and require the 43 | [`slurm-spank-lua`](https://github.com/stanford-rc/slurm-spank-lua) plugin to 44 | work. 45 | 46 | 47 | Once the `slurm-spank-lua` plugin is installed and configured, the 48 | `gpu_cmode.lua` script can be dropped in the appropriate directory (by default, 49 | `/etc/slurm/lua.d`, or any other location specified in the `plugstack.conf` 50 | configuration file). 51 | 52 | 53 | Note that both the Slurm SPANK Lua plugin and the GPU Compute mode Lua plugin 54 | will need to be present on both the submission host(s) (where 55 | `srun`/`sbatch` commands are executed) and the execution host(s) (where the job 56 | actually runs). 57 | 58 | 59 | _Note_: The plugin defines a default GPU compute mode (`exclusive`), which is 60 | used to re-set the GPUs at the end of a job. The default mode can be changed 61 | by editing the value of `default_cmode` in the script. 62 | 63 | 64 | 65 | ## Usage 66 | 67 | The Slurm SPANK GPU Compute Mode plugin introduces a new option to `srun` and 68 | `sbatch`: `--gpu_cmode`. 69 | 70 | ``` 71 | $ srun --help 72 | [...] 73 | --gpu_cmode= 74 | Set the GPU compute mode on the allocated GPUs to 75 | shared, exclusive or prohibited. Default is 76 | exclusive 77 | [...] 78 | ``` 79 | 80 | ### Examples 81 | 82 | ##### Requesting `Default` compute mode 83 | > `--gpu_cmode=shared` 84 | 85 | ``` 86 | $ srun --gres gpu:1 --gpu_cmode=shared "nvidia-smi --query-gpu=compute_mode --format=csv,noheader" 87 | Default 88 | ``` 89 | 90 | ##### Requesting `Exclusive-process` compute mode 91 | > `--gpu_cmode=exclusive` 92 | 93 | ``` 94 | $ srun --gres gpu:1 --gpu_cmode=exclusive nvidia-smi --query-gpu=compute_mode --format=csv,noheader 95 | Exclusive_Process 96 | ``` 97 | 98 | ##### Requesting `prohibited` compute mode 99 | > `--gpu_cmode=prohibited` 100 | 101 | ``` 102 | $ srun --gres gpu:1 --gpu_cmode=prohibited nvidia-smi --query-gpu=compute_mode --format=csv,noheader 103 | Prohibited 104 | ``` 105 | 106 | ##### Multi-GPU job 107 | 108 | ``` 109 | $ srun --gres gpu:4 --gpu_cmode=shared nvidia-smi --query-gpu=compute_mode --format=csv,noheader 110 | Default 111 | Default 112 | Default 113 | Default 114 | ``` 115 | 116 | ##### Multi-node job 117 | 118 | ``` 119 | $ srun -l -N 2 --ntasks-per-node=1 --gres gpu:1 --gpu_cmode=shared nvidia-smi --query-gpu=compute_mode --format=csv,noheader 120 | 1: Default 121 | 0: Default 122 | ``` 123 | 124 | **NB**: If the `--gpu_cmode` option is not used, no modification will be made 125 | to the current compute mode of the GPUs, and the site default will be used. 126 | 127 | -------------------------------------------------------------------------------- /gpu_cmode.lua: -------------------------------------------------------------------------------- 1 | -- ============================================================================ 2 | -- SPANK plugin to allow users to choose the compute mode on the GPUs allocated 3 | -- to their job. Requires `nvidia-smi` on the compute node, and the Slurm SPANK 4 | -- Lua plugin. 5 | -- 6 | -- Adds a --gpu_cmode=MODE option to srun/sbatch/salloc, with MODE: 7 | -- 0: shared 8 | -- 1: exclusive (exclusive_thread: deprecated, use 3) 9 | -- 2: prohibited 10 | -- 3: exclusive (exclusive_process) 11 | -- 12 | -- Reference: 13 | -- http://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#compute-modes 14 | -- 15 | -- # Author : Kilian Cavalotti 16 | -- # Created : 2018/01/22 17 | -- # License : GPL 2.0 18 | -- ============================================================================ 19 | 20 | 21 | -- 22 | -- constants ------------------------------------------------------------------ 23 | -- 24 | 25 | -- plugin name (for logging) 26 | -- 27 | myname = "SPANK:gpu_cmode" 28 | 29 | -- GPU compute modes definitions 30 | -- 31 | valid_cmodes = { 32 | [0]="shared", 33 | -- [1]="exclusive thread" deprecated 34 | [2]="prohibited", 35 | [3]="exclusive" 36 | } 37 | -- reverse index 38 | -- 39 | cmodes_index = {} 40 | for k,v in pairs(valid_cmodes) do cmodes_index[v]=k end 41 | 42 | -- default mode 43 | -- GPUs will be reset to that mode at the end of the job 44 | -- 45 | default_cmode = "exclusive" 46 | 47 | 48 | -- define new --gpu_cmode option for srun/salloc/sbatch 49 | -- 50 | spank_options = { 51 | { 52 | name = "gpu_cmode", 53 | usage = "Set the GPU compute mode on the allocated GPUs to " .. 54 | "shared, exclusive or prohibited. Default is " .. 55 | default_cmode , 56 | arginfo = "", 57 | has_arg = 1, 58 | cb = "opt_handler" 59 | }, 60 | } 61 | 62 | 63 | -- 64 | -- functions ------------------------------------------------------------------ 65 | -- 66 | 67 | -- execute command and return output 68 | -- 69 | function exec(cmd) 70 | local handle = io.popen (cmd) 71 | local result = handle:read("*a") or "" 72 | handle:close() 73 | result = string.gsub(result, "\n$", "") 74 | return result 75 | end 76 | 77 | -- validate compute mode 78 | -- 79 | function validate_cmode(cmode) 80 | for _, value in pairs(valid_cmodes) do 81 | if value == cmode then 82 | return true 83 | end 84 | end 85 | return false 86 | end 87 | 88 | -- check options 89 | -- 90 | function opt_handler(val, optarg, isremote) 91 | cmode = optarg 92 | if isremote or validate_cmode(optarg) then 93 | return SPANK.SUCCESS 94 | end 95 | return SPANK.FAILURE 96 | end 97 | 98 | 99 | -- 100 | -- SPANK functions ------------------------------------------------------------ 101 | -- cf. https://slurm.schedmd.com/spank.html 102 | -- 103 | 104 | -- SPANK function, called after privileges are temporarily dropped. 105 | -- needs to run as root, but in the job cgroup context, if any. 106 | -- 107 | function slurm_spank_task_init_privileged(spank) 108 | 109 | -- if context is not "remote" or compute mode is not defined, do nothing 110 | if spank.context ~= "remote" or cmode == nil then 111 | return SPANK.SUCCESS 112 | end 113 | 114 | -- get GPU ids from CUDA_VISIBLE_DEVICES 115 | device_ids = spank:getenv("CUDA_VISIBLE_DEVICES") 116 | if device_ids == nil or device_ids == "" then 117 | SPANK.log_error(myname .. ": CUDA_VISIBLE_DEVICES not set.") 118 | return SPANK.FAILURE 119 | end 120 | 121 | -- Setting compute mode is not supported on MIG-enabled devices 122 | if device_ids:find("MIG-") then 123 | SPANK.log_user(myname .. ": ignoring compute mode setting on " .. 124 | "MIG-enabled device") 125 | return SPANK.SUCCESS 126 | end 127 | 128 | -- check for nvidia-smi 129 | nvs_path = exec("which nvidia-smi") 130 | if nvs_path:match("nvidia%-smi$") == nil then 131 | SPANK.log_error(myname .. ": can't find nvidia-smi in PATH.") 132 | return SPANK.FAILURE 133 | end 134 | 135 | -- set compute mode on GPUs 136 | SPANK.log_info(myname .. ": changing compute mode to '%s' on GPU(s): %s\n", 137 | cmode, device_ids) 138 | local cmd = nvs_path .. " -c " .. cmodes_index[cmode] .. 139 | " -i " .. device_ids 140 | local ret = 0 141 | if _VERSION <= 'Lua 5.1' then 142 | ret = tonumber(os.execute(cmd)) 143 | else 144 | _, _, ret = os.execute(cmd) 145 | end 146 | SPANK.log_debug(myname .. ": DEBUG: cmd = %s\n", cmd) 147 | SPANK.log_debug(myname .. ": DEBUG: ret = %s\n", ret) 148 | 149 | -- check return code 150 | if ret ~= 0 then 151 | SPANK.log_error(myname .. ": error setting compute mode go to '%s'" .. 152 | " on GPU(s): %s\n", cmode, device_ids) 153 | return SPANK.FAILURE 154 | end 155 | 156 | return SPANK.SUCCESS 157 | end 158 | 159 | 160 | -- SPANK function called for each task as its exit status is collected by Slurm 161 | -- needs to run as root, in the job cgroup context, if any. 162 | -- 163 | function slurm_spank_task_exit(spank) 164 | 165 | -- if context is not "remote" or compute mode is not defined, do nothin' 166 | if spank.context ~= "remote" or cmode == nil then 167 | return SPANK.SUCCESS 168 | end 169 | 170 | -- get GPU ids from CUDA_VISIBLE_DEVICES 171 | device_ids = spank:getenv("CUDA_VISIBLE_DEVICES") 172 | if device_ids == nil or device_ids == "" then 173 | SPANK.log_error(myname .. ": CUDA_VISIBLE_DEVICES not set.") 174 | return SPANK.FAILURE 175 | end 176 | 177 | -- Setting compute mode is not supported on MIG-enabled devices 178 | if device_ids:find("MIG-") then 179 | SPANK.log_user(myname .. ": ignoring compute mode setting on " .. 180 | "MIG-enabled device") 181 | return SPANK.SUCCESS 182 | end 183 | 184 | -- check for nvidia-smi 185 | nvs_path = exec("which nvidia-smi") 186 | if nvs_path:match("nvidia%-smi$") == nil then 187 | SPANK.log_error(myname .. ": can't find nvidia-smi in PATH.") 188 | return SPANK.FAILURE 189 | end 190 | 191 | -- reset compute mode on GPUs 192 | SPANK.log_info(myname .. ": resetting compute mode to default '%s'" .. 193 | " on GPU(s): %s\n", default_cmode, device_ids) 194 | local cmd = nvs_path .. " -c " .. cmodes_index[default_cmode] .. 195 | " -i " .. device_ids 196 | local ret = 0 197 | if _VERSION <= 'Lua 5.1' then 198 | ret = tonumber(os.execute(cmd)) 199 | else 200 | _, _, ret = os.execute(cmd) 201 | end 202 | SPANK.log_debug(myname .. ": DEBUG: cmd = %s\n", cmd) 203 | SPANK.log_debug(myname .. ": DEBUG: ret = %s\n", ret) 204 | 205 | -- check return 206 | if ret ~= 0 then 207 | SPANK.log_error(myname .. ": error resetting compute mode to default".. 208 | " '%s' on GPU(s): %s\n", default_cmode, device_ids) 209 | return SPANK.FAILURE 210 | end 211 | 212 | return SPANK.SUCCESS 213 | end 214 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. 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