Messages in this thread | | | Date | Fri, 7 Dec 2001 07:11:29 +0100 (CET) | From | Mike Galbraith <> | Subject | Re: horrible disk thorughput on itanium |
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On 6 Dec 2001, Andi Kleen wrote:
> Andrew Morton <akpm@zip.com.au> writes: > > > > The fact that you get the same throughput on each platform with > > the block I/O part of the test indicates that the hardware and > > kernel are OK, but the C library is broken. > > The usual difference is if you have a pthreads capable C library > or not. For newer glibc bonnie++ should definitely use > putc_unlocked(); otherwise it'll eat lock overhead for each character > to take the FILE lock. > > As far as I can see bonnie++ doesn't use putc_unlocked, but putc.
Plain old Bonnie suffered from the same thing. I long ago made it use putc_unlocked() here because throughput was horrible otherwise.
-Mike
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