Original Message from: Burakov, Anatoly [mailto:anatoly.bura...@intel.com]
>I just realized that, unless you're using --legacy-mem switch, one other >way to alleviate the issue would be to use --single-file-segments >option. This will still store the fd's, however it will only do so per >memseg list, not per page. So, instead of 1000's of fd's with 2MB pages, >you'd end up with under 10. Hope this helps! Hi Anatoly, Thanks for the update and suggestion. We did try using --single-file-segments previously. Although it lowers the amount of fd's allocated for tracking the segments as you noted, there is still a problem. It seems that a .lock file is created for each huge page, not for each segment. So with 2MB pages the glibc limit of 1024 fd's is still exhausted quickly if there is ~2GB of 2MB huge pages. Edwin can provide more details from his testing. In our case much sooner, as we already use >500 fd's for the application, just 1GB of 2MB huge pages is enough to hit the fd limit due to the .lock files. Thanks.
