lmbench hangs with memsize set to > 2GiB
Bug #290757 reported by
Carsten Schlote
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
lmbench (Ubuntu) |
New
|
Undecided
|
Unassigned |
Bug Description
Binary package hint: lmbench
lmbench:
Installiert:
Mögliche Pakete:3.0-a7-1
Versions-Tabelle:
*** 3.0-a7-1 0
500 http://
100 /var/lib/
The memsize test hangs in an endless loop if started with >= 2GiB of memory seleted at lmbench_run prompt. With just 1000MB the test completed within some seconds. The proposed value on the prompt of about 2800MB caused problems and the memsize didn't complete within 1 hour.
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I'm guessing that this probably only happens on 32-bit systems? That would be caused by lmbench scripts deciding that 70% is the right amount of memory to use, which is a problem when the max amount per process is 2GiB and you have considerably more than that.
Solution: don't try to use >2 GiB RAM on 32-bit systems. Considering the purpose to be able to avoid the cache affecting your test results, you don't really need to use that much anyway.