From: Paolo Bonzini <pbonzini@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>,
Anthony Liguori <aliguori@us.ibm.com>,
Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/2] coroutine: introduce coroutines
Date: Wed, 25 May 2011 09:32:36 +0200 [thread overview]
Message-ID: <4DDCB094.6080100@redhat.com> (raw)
In-Reply-To: <4DDC2175.3020107@codemonkey.ws>
On 05/24/2011 11:21 PM, Anthony Liguori wrote:
> Why not use threads as a coroutine fallback? That's essentially what we
> would do to be "fully threaded".
Not exactly, there would be much less synchronization going on. Using
threads to implement coroutines means you go through the slow path of
the synchronization primitives (either mutexes/condvars or barriers)
twice or more per coroutine switch. It is really slow, a 100 times
difference perhaps.
Paolo
next prev parent reply other threads:[~2011-05-25 15:03 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 10:15 [Qemu-devel] [PATCH 0/2] Coroutines for better asynchronous programming Stefan Hajnoczi
2011-05-11 10:15 ` [Qemu-devel] [PATCH 1/2] coroutine: introduce coroutines Stefan Hajnoczi
2011-05-11 11:20 ` Kevin Wolf
2011-05-11 12:04 ` Paolo Bonzini
2011-05-11 12:15 ` Kevin Wolf
2011-05-11 12:51 ` Anthony Liguori
2011-05-11 12:52 ` Paolo Bonzini
2011-05-11 13:05 ` Anthony Liguori
2011-05-11 13:45 ` Paolo Bonzini
2011-05-11 13:51 ` Daniel P. Berrange
2011-05-24 19:37 ` Jamie Lokier
2011-05-24 19:58 ` Stefan Hajnoczi
2011-05-24 20:51 ` Jamie Lokier
2011-05-25 7:09 ` Stefan Hajnoczi
2011-05-25 18:54 ` Richard Henderson
2011-05-24 21:21 ` Anthony Liguori
2011-05-25 7:32 ` Paolo Bonzini [this message]
2011-05-24 21:22 ` Anthony Liguori
2011-05-25 11:43 ` Bastien ROUCARIES
2011-05-11 12:36 ` Anthony Liguori
2011-05-11 12:46 ` Paolo Bonzini
2011-05-11 12:54 ` Stefan Hajnoczi
2011-05-11 13:08 ` Kevin Wolf
2011-05-11 19:12 ` Stefan Weil
2011-05-12 7:59 ` Kevin Wolf
2011-05-12 9:51 ` Jan Kiszka
2011-05-12 9:59 ` Stefan Hajnoczi
2011-05-24 19:54 ` Jamie Lokier
2011-05-12 10:02 ` Kevin Wolf
2011-05-11 10:15 ` [Qemu-devel] [PATCH 2/2] coroutine: add check-coroutine automated tests Stefan Hajnoczi
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