search

ZaidQureshi / bam

BSD 2-Clause "Simplified" License
120 stars 29 forks source link

The program (vectorAdd) hangs when page cache is oversubscribed #11

Closed lineagech closed 1 year ago

lineagech commented 1 year ago

I did the test for page cache oversubscription with very simple setting:

Environment: 

Linux 5.4.0-131-generic #147-Ubuntu SMP
CPU: Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz
GPU: Nvidia A100 @ 1410 MHz
Driver version: 515.65.01
CUDA version: CUDA 11.7

benchmark/vectoradd/settings.h:

numThreads = 256;
maxPageCacheSize = 2097152;
n_elems = 131072;

The program would hang because https://github.com/ZaidQureshi/bam/blob/ca34b6e3c8e62afb40a026a26411381e63abdfb8/include/page_cache.h#L1836 cnt never decreased to zero so the page could not be reused.

I also encountered this issue sometimes when I used the large size (like heisenbug...):

benchmark/vectoradd/settings.h:

numThreads = 256;
maxPageCacheSize = 12884901888;
n_elems = 1073741824;
msharmavikram commented 1 year ago

Is this still an issue, if yes, please reopen. Else I am closing this.