Date: Tue, 14 Oct 2014 22:22:55 -0500 From: Jim Bell <Jim@JC-Bell.com> To: Brooks Davis <brooks@freebsd.org> Cc: freebsd-performance@freebsd.org Subject: Re: ar performing abysmally Message-ID: <543DE88F.1050608@JC-Bell.com> In-Reply-To: <20141014150526.GB32476@spindle.one-eyed-alien.net> References: <543CBEB5.3020105@JC-Bell.com> <20141014150526.GB32476@spindle.one-eyed-alien.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On 2014-10-14 10:05 AM, Brooks Davis wrote:
> On Tue, Oct 14, 2014 at 01:12:05AM -0500, Jim Bell wrote:
>> ...
>>
>> ?time ar -v -c -u -q ...? : 362.62 real 0.11 user 0.82 sys.
>> ?time ar -v -c -r -u -s ...?: 407.94 real 0.13 user 0.80 sys
>>
>> ...
> If you want to eliminate the disk as possible source I'd try doing the ar
> run on a memory disk if the inputs will fit (you should be able to send
> the output to /dev/null).
Thanks for the input!
ar doesn't like /dev/null, but I set up a ramdisk and that works great!
time ar -v -c -r -u -s ...
0.70 real 0.10 user 0.34 sys
Not bad for a 77MB lib.a file.
> It's worth noting that ar doesn't really do anything particularly
> complicated, ...
Yeah, truss indicated it wasn't doing much but writing.
Any pointers for what's killing my disk writes? I'll hound my ISP, but
would love help from folks here.
Thanks again,
-Jim
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?543DE88F.1050608>