regression.sh: use a zram device for /d when available #213
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It has been observed that AWS builder instances are very slow sometimes, apparently because of a limited IOPS. To avoid this issue, the script regression.sh has been modified to try to mount /d on a zram device, which will drastically reduce the number of IOPS sent to AWS disks. If the zram device cannot be created for some reason, it falls back to the old loop device. This change should avoid spurious timeout failures caused by too long executions, and it should also prevent failures in tests that are time-dependent. Signed-off-by: Xavi Hernandez <[email protected]>
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@mscherer this change should help reduce spurious failures in the regression suite. Could you take a look, please ? If I'm nor wrong, /d is also used to store the built programs. This should be changed. Otherwise all compiled programs will be deleted when regression.sh is run. |
mykaul
reviewed
May 8, 2023
Signed-off-by: Xavi Hernandez <[email protected]>
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(unrelated to this patch, we should also build against zram device instead of the EBS disks) |
I tried this and it seems to work with the current tests, but builder machines are very limited (2 cores, 4 GiB if I'm not wrong). So adding more pressure to memory may be bad if some test really requires to use a significant amount of space. |
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It has been observed that AWS builder instances are very slow sometimes, apparently because of a limited IOPS. To avoid this issue, the script regression.sh has been modified to try to mount /d on a zram device, which will drastically reduce the number of IOPS sent to AWS disks. If the zram device cannot be created for some reason, it falls back to the old loop device.
This change should avoid spurious timeout failures caused by too long executions, and it should also prevent failures in tests that are time-dependent.