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Re: [PATCH 0/2] Better handling of slow remote transfers
- From: Gary Benson <gbenson at redhat dot com>
- To: Pedro Alves <palves at redhat dot com>
- Cc: Sandra Loosemore <sandra at codesourcery dot com>, Joel Brobecker <brobecker at adacore dot com>, Doug Evans <dje at google dot com>, Jan Kratochvil <jan dot kratochvil at redhat dot com>, gdb-patches <gdb-patches at sourceware dot org>, André Pönitz <apoenitz at t-online dot de>, Paul Koning <Paul_Koning at dell dot com>
- Date: Thu, 20 Aug 2015 19:01:22 +0100
- Subject: Re: [PATCH 0/2] Better handling of slow remote transfers
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- References: <20150814182648 dot GO22245 at adacore dot com> <55CE6AA3 dot 8000300 at codesourcery dot com> <20150816184913 dot GA2998 at adacore dot com> <20150817085310 dot GC25320 at blade dot nx> <55D1EE96 dot 9060202 at codesourcery dot com> <20150818095858 dot GB9815 at blade dot nx> <55D3625B dot 40101 at codesourcery dot com> <55D3DB83 dot 4050204 at redhat dot com> <20150819134242 dot GA18586 at blade dot nx> <55D5E84E dot 5060303 at redhat dot com>
Pedro Alves wrote:
> Hey, that was a quick and dirty patch. :-)
I know, no worries :)
> Here's a cleaned up version. WDYT?
[snip
> This patch almost halves the time it takes to "target remote + run
> to main" on a higher-latency connection.
>
> E.g., I've got a ping time of ~85ms to an x86-64 machine on the gcc
> compile farm (almost 2000km away from me), and I'm behind a ~16Mbit
> ADSL. When I connect to a gdbserver debugging itself on that machine
> and run to main, it takes almost 55 seconds:
[snip]
> real 0m54.803s
> user 0m0.329s
> sys 0m0.064s
>
> While the readahead cache added by this patch, it drops to:
>
> real 0m29.462s
> user 0m0.454s
> sys 0m0.054s
>
> I added a few counters to show cache hit/miss, and got:
>
> readahead cache miss 142
> readahead cache hit 310
>
> Tested on x86_64 Fedora 20.
Very nice, please commit!
Thanks,
Gary
--
http://gbenson.net/