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dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:35188 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLOPY-0002zo-Ej for qemu-devel@archiver.kernel.org; Thu, 24 Sep 2020 06:23:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41150) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLNZj-0002RY-KW for qemu-devel@nongnu.org; Thu, 24 Sep 2020 05:30:03 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:46669) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kLNZh-00070v-LB for qemu-devel@nongnu.org; Thu, 24 Sep 2020 05:30:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600939800; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=li97aJVog3jEPGKhQHb+TFzLPraaKtwKqK96TVdANYU=; b=Ny5s01DUUUZVCJunFbw6+OcDHZtNznxZ1XeIPVnMWE7Z0gOuYH7Btfw8Of90sL4+8CjRm2 8paat8VapEqfFw46s0juykM2lVrz9evzR8Gqyybjg2HrzJ4k66I3x8GiT84L9g2GvgWXw0 +e6VRmQNyktl42+TkHziX/hrJBWAX5c= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-125-erQpARUzNl6UTTAo2mMA4Q-1; Thu, 24 Sep 2020 05:29:46 -0400 X-MC-Unique: erQpARUzNl6UTTAo2mMA4Q-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 84B431007476; Thu, 24 Sep 2020 09:29:45 +0000 (UTC) Received: from work-vm (ovpn-114-250.ams2.redhat.com [10.36.114.250]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BFDA55C1C7; Thu, 24 Sep 2020 09:29:37 +0000 (UTC) Date: Thu, 24 Sep 2020 10:29:35 +0100 From: "Dr. David Alan Gilbert" To: Vivek Goyal Subject: Re: [PATCH] virtiofsd: Used glib "shared" thread pool Message-ID: <20200924092935.GC2792@work-vm> References: <20200921213216.GE13362@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200921213216.GE13362@redhat.com> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 23:02:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.228, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: virtio-fs-list , qemu-devel@nongnu.org, Stefan Hajnoczi , Miklos Szeredi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Vivek Goyal (vgoyal@redhat.com) wrote: > glib offers thread pools and it seems to support "exclusive" and "shared" > thread pools. > > https://developer.gnome.org/glib/stable/glib-Thread-Pools.html#g-thread-pool-new > > Currently we use "exlusive" thread pools but its performance seems to be > poor. I tried using "shared" thread pools and performance seems much > better. I posted performance results here. > > https://www.redhat.com/archives/virtio-fs/2020-September/msg00080.html > > So lets switch to shared thread pools. We can think of making it optional > once somebody can show in what cases exclusive thread pools offer better > results. For now, my simple performance tests across the board see > better results with shared thread pools. > > Signed-off-by: Vivek Goyal Queued (with Miklos's seccomp fix); although my gut feeling is we'll be coming back to this again to understand how the threading should work. Dave > --- > tools/virtiofsd/fuse_virtio.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > Index: qemu/tools/virtiofsd/fuse_virtio.c > =================================================================== > --- qemu.orig/tools/virtiofsd/fuse_virtio.c 2020-09-21 17:28:27.444438015 -0400 > +++ qemu/tools/virtiofsd/fuse_virtio.c 2020-09-21 17:28:30.584568910 -0400 > @@ -695,7 +695,7 @@ static void *fv_queue_thread(void *opaqu > struct fuse_session *se = qi->virtio_dev->se; > GThreadPool *pool; > > - pool = g_thread_pool_new(fv_queue_worker, qi, se->thread_pool_size, TRUE, > + pool = g_thread_pool_new(fv_queue_worker, qi, se->thread_pool_size, FALSE, > NULL); > if (!pool) { > fuse_log(FUSE_LOG_ERR, "%s: g_thread_pool_new failed\n", __func__); -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK