From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Lieven <pl@kamp.de>, qemu-devel@nongnu.org
Cc: kwolf@redhat.com, ming.lei@canonical.com, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH 7/7] coroutine: try harder not to delete coroutines
Date: Sat, 29 Nov 2014 15:27:26 +0100 [thread overview]
Message-ID: <5479D7CE.8060200@redhat.com> (raw)
In-Reply-To: <5478E0A5.6060405@kamp.de>
On 28/11/2014 21:52, Peter Lieven wrote:
>
> master:
> Run operation 40000000 iterations 13.612604 s, 2938K operations/s, 340ns per coroutine
>
> this series up to patch 6:
> Run operation 40000000 iterations 10.428382 s, 3835K operations/s, 260ns per coroutine
>
> this series up to patch 7:
> Run operation 40000000 iterations 9.112539 s, 4389K operations/s, 227ns per coroutine
>
> So this confirms the +33% Paolo sees up to Patch 5. But I have yet fully understood the
> +15% that this Patch gains.
No atomic operations once the release pool gets full. We're talking of
800 clock cycles here, and one atomic operation costs 50 cycles. 100
clock cycles out of 800 = 15% speedup (8/7 = 1.14).
Paolo
next prev parent reply other threads:[~2014-11-29 14:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-28 14:12 [Qemu-devel] [PATCH 0/7] coroutine: optimizations Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 1/7] coroutine-ucontext: use __thread Paolo Bonzini
2014-11-28 14:28 ` Peter Maydell
2014-11-28 14:45 ` Markus Armbruster
2014-11-28 15:36 ` Kevin Wolf
2014-11-28 14:12 ` [Qemu-devel] [PATCH 2/7] qemu-thread: add per-thread atexit functions Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 3/7] test-coroutine: avoid overflow on 32-bit systems Paolo Bonzini
2014-12-01 1:28 ` Ming Lei
2014-12-01 12:41 ` Paolo Bonzini
2014-12-02 1:20 ` Ming Lei
2014-11-28 14:12 ` [Qemu-devel] [PATCH 4/7] QSLIST: add lock-free operations Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 5/7] coroutine: rewrite pool to avoid mutex Paolo Bonzini
2014-11-28 16:40 ` Kevin Wolf
2014-11-28 17:30 ` Paolo Bonzini
2014-11-28 17:31 ` Paolo Bonzini
2014-11-28 18:34 ` Kevin Wolf
2014-11-28 19:57 ` Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 6/7] coroutine: drop qemu_coroutine_adjust_pool_size Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 7/7] coroutine: try harder not to delete coroutines Paolo Bonzini
2014-11-28 20:52 ` Peter Lieven
2014-11-29 14:27 ` Paolo Bonzini [this message]
2014-11-29 21:28 ` Peter Lieven
2014-11-29 14:28 ` Paolo Bonzini
2014-12-01 5:55 ` [Qemu-devel] [PATCH 0/7] coroutine: optimizations Ming Lei
2014-12-01 7:05 ` Peter Lieven
2014-12-01 7:46 ` Ming Lei
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