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From tommy xiao <xia...@gmail.com>
Subject Re: 答复: Optimize libprocess performance
Date Tue, 10 Jan 2017 15:05:45 GMT
Looking forward to seeing the benchmarks.

2017-01-06 5:52 GMT+08:00 Benjamin Mahler <bmahler@apache.org>:

> Ok great, thanks for sharing. Looking forward to seeing the benchmarks.
>
> On Wed, Jan 4, 2017 at 10:31 PM, pangbingqiang <pangbingqiang@huawei.com>
> wrote:
>
> > We write a light k-v database ,use for metadata store and nameservice
> like
> > etcd, but we test its TPS just 1200+(one client), the network is not the
> > bottleneck, so the RPC layer is too heavy.
> >
> > -----邮件原件-----
> > 发件人: Benjamin Mahler [mailto:bmahler@apache.org]
> > 发送时间: 2017年1月5日 9:26
> > 收件人: dev
> > 抄送: user@mesos.apache.org
> > 主题: Re: Optimize libprocess performance
> >
> > Which areas does the performance not meet your needs? There are a lot of
> > aspects to libprocess that can be optimized, so it would be good to focus
> > on each of your particular use cases via benchmarks, this allows us to
> have
> > a shared way to profile and measure improvements.
> >
> > Copy elimination is one area where a lot of improvement can be made
> across
> > libprocess, note that libprocess was implemented before we had C++11 move
> > support available. We've recently made some improvements to update the
> HTTP
> > serving path towards zero-copies but it's not completely done. Can you
> > submit patches for the ProcessBase::send() path copy elimination? We can
> > have a move overload for ProcessBase::send and have
> ProtobufProcess::send()
> > and encode() perform moves instead of a copy.
> >
> > With respect to the MessageEncoder, since it's less trivial, you can
> > submit a benchmark that captures the use case you care about and we can
> > drive improvements using it. I have some suggestions here as well but we
> > can discuss once we have the benchmarks committed.
> >
> > How does that sound to start?
> >
> > On Tue, Jan 3, 2017 at 7:31 PM, pangbingqiang <pangbingqiang@huawei.com>
> > wrote:
> >
> > > Hi All:
> > >
> > >   We use libprocess as our underlying communication library, but we
> > > find it’s performance don’t meet, we want to optimize it, for example:
> > >
> > > *  ‘send’ function *implementation one metadata has four times memory
> > > copy,
> > >
> > > *1. ProtobufMessage SerializeToString then processbase ‘encode’
> > > construct string once;*
> > >
> > > *2. In ‘encode’ function Message body copy again;*
> > >
> > > *3. In MessageEncoder in order to construct HTTP Request, copy again;*
> > >
> > > *4.       **MessageEncoder return copy again;*
> > >
> > >   How to optimize this scenario may be useful.
> > >
> > >   Also , in libprocess it has so many lock:
> > >
> > > *1.       **SocketManager:   std::recursive_mutex mutex;*
> > >
> > > *2.       **ProcessManager:  std::recursive_mutex processes_mutex;*
> > *std::recursive_mutex
> > > runq_mutex; std::recursive_mutex firewall_mutex;*
> > >
> > > In particular, everytime event enqueue/dequeue both need to get lock,
> > > maybe use lookfree struct is better.
> > >
> > >
> > >
> > > If have any optimize suggestion or discussion, please let me know,
> > thanks.
> > >
> > >
> > >
> > > [image: cid:image001.png@01D0E8C5.8D08F440]
> > >
> > >
> > >
> > > Bingqiang Pang(庞兵强)
> > >
> > >
> > >
> > > Distributed and Parallel Software Lab
> > >
> > > Huawei Technologies Co., Ltd.
> > >
> > > Email:pangbingqiang@huawei.com <suteng@huawei.com>
> > >
> > >
> > >
> > >
> > >
> >
>



-- 
Deshi Xiao
Twitter: xds2000
E-mail: xiaods(AT)gmail.com

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