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Add kernel accel limiter based on kernel threads to reduce host memory requirements

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This commit is contained in:
Jens Steube 2019-11-19 17:59:50 +01:00
parent 53181c781b
commit 424777ae28
1 changed files with 11 additions and 0 deletions
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11
src/backend.c
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@ -9405,6 +9405,17 @@ int backend_session_begin (hashcat_ctx_t *hashcat_ctx)
u32 kernel_accel_min = device_param->kernel_accel_min;
u32 kernel_accel_max = device_param->kernel_accel_max;
/**
* We need a kernel accel limiter otherwise we will allocate too much memory (Example 4* GTX1080):
* 4 (gpus) * 260 (sizeof pw_t) * 3 (pws, pws_comp, pw_pre) * 20 (MCU) * 1024 (threads) * 1024 (accel) = 65,431,142,400 bytes RAM!!
*/
const u32 accel_limit = CEILDIV ((64 * 1024), kernel_threads); // this should result in less than 4GB per GPU, but allow higher accel in case user reduces the threads manually using -T
kernel_accel_max = MIN (kernel_accel_max, accel_limit);
kernel_accel_min = MIN (kernel_accel_min, kernel_accel_max);
// find out if we would request too much memory on memory blocks which are based on kernel_accel
u64 size_pws = 4;