Subject: Re: from cheetah to snail
To: YAMAMOTO Takashi <firstname.lastname@example.org>
From: Frank Kardel <email@example.com>
Date: 02/05/2004 10:25:05
YAMAMOTO Takashi wrote:
>>>% uname -sr && uptime && pmap 0 | wc -l
>>> 3:27PM up 22:16, 6 users, load averages: 1.33, 1.62, 1.63
>>>% Wed Feb 4 16:34:17 GMT 2004
>>>As in it took 1:07 to do the pmap.. At least that gives 2 options:
>>>- try compiling with NEW_BUFQ_STRATEGY
>>As i expected this didn't improve the situation much.
>>- ps running with about 70ms system time.
>>- starting to build a release - ps takes about 6 seconds system time.
>> - Around 6800 entries in kernel map.
>>- after release build
>> - ps alxww: 0.029u 27.702s 0:28.01 98.9% 0+0k 0+0io 2pf+0w -> @96 procs: ~290 ms/process!
>> - pmap 0 | wc: 23017 138098 1148633
>>Looks like ps/pmap suffer immensely from recent changes. Also
>>ps/pmap seem in invoke operations that do not scale well and
>>seem to be related to kernel map fragmentation.
>>BTW: kernel.maxvnodes is 128000.
>is your kernel has DEBUG option?
Excellent remark - YES DEBUG/DIAGNOSTIC is on. I will try a