RE: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
Hi Mark, The Async result in 128K drops quickly after some point, is that because of the testing methodology? Other conclusion looks to me like simple messenger + Jemalloc is the best practice till now as it has the same performance as async but using much less memory? -Xiaoxi > -Original Message- > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of > Mark Nelson > Sent: Tuesday, October 13, 2015 9:03 PM > To: Haomai Wang > Cc: ceph-devel; ceph-us...@lists.ceph.com > Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger vs > AsyncMessenger results > > Hi Haomai, > > Great! I haven't had a chance to dig in and look at it with valgrind yet, > but if I > get a chance after I'm done with newstore fragment testing and somnath's > writepath work I'll try to go back and dig in if you haven't had a chance yet. > > Mark > > On 10/12/2015 09:56 PM, Haomai Wang wrote: > > resend > > > > On Tue, Oct 13, 2015 at 10:56 AM, Haomai Wang <haomaiw...@gmail.com> > wrote: > >> COOL > >> > >> Interesting that async messenger will consume more memory than > >> simple, in my mind I always think async should use less memory. I > >> will give a look at this > >> > >> On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson <mnel...@redhat.com> > wrote: > >>> > >>> Hi Guy, > >>> > >>> Given all of the recent data on how different memory allocator > >>> configurations improve SimpleMessenger performance (and the effect > >>> of memory allocators and transparent hugepages on RSS memory usage), > >>> I thought I'd run some tests looking how AsyncMessenger does in > >>> comparison. We spoke about these a bit at the last performance > meeting but here's the full write up. > >>> The rough conclusion as of right now appears to be: > >>> > >>> 1) AsyncMessenger performance is not dependent on the memory > >>> allocator like with SimpleMessenger. > >>> > >>> 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + > >>> 32MB (ie > >>> default) thread cache. > >>> > >>> 3) AsyncMessenger is consistently faster than SimpleMessenger for > >>> 128K random reads. > >>> > >>> 4) AsyncMessenger is sometimes slower than SimpleMessenger when > >>> memory allocator optimizations are used. > >>> > >>> 5) AsyncMessenger currently uses far more RSS memory than > SimpleMessenger. > >>> > >>> Here's a link to the paper: > >>> > >>> https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view > >>> > >>> Mark > >>> ___ > >>> ceph-users mailing list > >>> ceph-us...@lists.ceph.com > >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >> > >> > >> > >> > >> -- > >> > >> Best Regards, > >> > >> Wheat > > > > > > > ___ > ceph-users mailing list > ceph-us...@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
Hi Xiaoxi, I would ignore the tails on those tests. I suspect it's just some fio processes finishing earlier than others and the associated aggregate performance dropping off. These reads tests are so fast that my original guess at reasonable volume sizes for 300 second tests appear to be off. Mark On 10/14/2015 10:57 AM, Chen, Xiaoxi wrote: Hi Mark, The Async result in 128K drops quickly after some point, is that because of the testing methodology? Other conclusion looks to me like simple messenger + Jemalloc is the best practice till now as it has the same performance as async but using much less memory? -Xiaoxi -Original Message- From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Mark Nelson Sent: Tuesday, October 13, 2015 9:03 PM To: Haomai Wang Cc: ceph-devel; ceph-us...@lists.ceph.com Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results Hi Haomai, Great! I haven't had a chance to dig in and look at it with valgrind yet, but if I get a chance after I'm done with newstore fragment testing and somnath's writepath work I'll try to go back and dig in if you haven't had a chance yet. Mark On 10/12/2015 09:56 PM, Haomai Wang wrote: resend On Tue, Oct 13, 2015 at 10:56 AM, Haomai Wang <haomaiw...@gmail.com> wrote: COOL Interesting that async messenger will consume more memory than simple, in my mind I always think async should use less memory. I will give a look at this On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson <mnel...@redhat.com> wrote: Hi Guy, Given all of the recent data on how different memory allocator configurations improve SimpleMessenger performance (and the effect of memory allocators and transparent hugepages on RSS memory usage), I thought I'd run some tests looking how AsyncMessenger does in comparison. We spoke about these a bit at the last performance meeting but here's the full write up. The rough conclusion as of right now appears to be: 1) AsyncMessenger performance is not dependent on the memory allocator like with SimpleMessenger. 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB (ie default) thread cache. 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K random reads. 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory allocator optimizations are used. 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. Here's a link to the paper: https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view Mark ___ ceph-users mailing list ceph-us...@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Best Regards, Wheat ___ ceph-users mailing list ceph-us...@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
Yep, as I said below, I consider to add auto scale up/down for worker threads with connection load balance ability. It may let users not entangled with how much thread number I need. :-( Actually thread number for config value is a pain in ceph osd io stack. On Tue, Oct 13, 2015 at 2:45 PM, Somnath Roy <somnath@sandisk.com> wrote: > Thanks Haomai.. > Since Async messenger is always using a constant number of threads , there > could be a potential performance problem of scaling up the client connections > keeping the constant number of OSDs ? > May be it's a good tradeoff.. > > Regards > Somnath > > > -Original Message- > From: Haomai Wang [mailto:haomaiw...@gmail.com] > Sent: Monday, October 12, 2015 11:35 PM > To: Somnath Roy > Cc: Mark Nelson; ceph-devel; ceph-us...@lists.ceph.com > Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger vs > AsyncMessenger results > > On Tue, Oct 13, 2015 at 12:18 PM, Somnath Roy <somnath@sandisk.com> wrote: >> Mark, >> >> Thanks for this data. This means probably simple messenger (not OSD >> core) is not doing optimal job of handling memory. >> >> >> >> Haomai, >> >> I am not that familiar with Async messenger code base, do you have an >> explanation of the behavior (like good performance with default >> tcmalloc) Mark reported ? Is it using lot less thread overall than Simple ? > > Originally async messenger mainly want to solve with high thread number > problem which limited the ceph cluster size. High context switch and cpu > usage caused by simple messenger under large cluster. > > Recently we have memory problem discussed on ML and I also spend times to > think about the root cause. Currently I would like to consider the simple > messenger's memory usage is deviating from the design of tcmalloc. Tcmalloc > is aimed to provide memory with local cache, and it also has memory control > among all threads, if we have too much threads, it may let tcmalloc busy with > memory lock contention. > > Async messenger uses thread pool to serve connections, it make all blocking > calls in simple messenger async. > >> >> Also, it seems Async messenger has some inefficiencies in the io path >> and that’s why it is not performing as well as simple if the memory >> allocation stuff is optimally handled. > > Yep, simple messenger use two threads(one for read, one for write) to serve > one connection, async messenger at most have one thread to serve one > connection and multi connection will share the same thread. > > Next, I would like to have several plans to improve performance: > 1. add poll mode support, I hope it can help enhance high performance storage > need 2. add load balance ability among worker threads 3. move more works out > of messenger thread. > >> >> Could you please send out any documentation around Async messenger ? I >> tried to google it , but, not even blueprint is popping up. > >> >> >> >> >> >> Thanks & Regards >> >> Somnath >> >> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf >> Of Haomai Wang >> Sent: Monday, October 12, 2015 7:57 PM >> To: Mark Nelson >> Cc: ceph-devel; ceph-us...@lists.ceph.com >> Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger >> vs AsyncMessenger results >> >> >> >> COOL >> >> >> >> Interesting that async messenger will consume more memory than simple, >> in my mind I always think async should use less memory. I will give a >> look at this >> >> >> >> On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson <mnel...@redhat.com> wrote: >> >> Hi Guy, >> >> Given all of the recent data on how different memory allocator >> configurations improve SimpleMessenger performance (and the effect of >> memory allocators and transparent hugepages on RSS memory usage), I >> thought I'd run some tests looking how AsyncMessenger does in >> comparison. We spoke about these a bit at the last performance meeting but >> here's the full write up. >> The rough conclusion as of right now appears to be: >> >> 1) AsyncMessenger performance is not dependent on the memory allocator >> like with SimpleMessenger. >> >> 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB >> (ie >> default) thread cache. >> >> 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K >> random reads. >> >> 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory >>
RE: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
> -Original Message- > From: ceph-devel-ow...@vger.kernel.org [mailto:ceph-devel- > ow...@vger.kernel.org] On Behalf Of Somnath Roy > Sent: Tuesday, October 13, 2015 8:46 AM > > Thanks Haomai.. > Since Async messenger is always using a constant number of threads , there > could be a potential performance problem of scaling up the client > connections keeping the constant number of OSDs ? > May be it's a good tradeoff.. It's not that big issue when you look realistically at it. In fact, having more threads than around 2 * available_logical_cpus is going to drag performance down, so it's better to have thread wait than make it forcing context switches. The point of using more threads per process is to have it spend less time waiting for I/O and better utilize current multi-core CPUs. Having threads fighting for CPU and/or I/O time is worse than having them underutilized, which is particularly true with spinning drives (which aren't going anywhere any soon; not every customer is going to accept $1700 price tag per drive that has only 800GB of capacity) and slower CPUs (again, not every customer is going to accept $1200 price tag per CPU). With best regards / Pozdrawiam Piotr Dałek
RE: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
Thanks Haomai.. Since Async messenger is always using a constant number of threads , there could be a potential performance problem of scaling up the client connections keeping the constant number of OSDs ? May be it's a good tradeoff.. Regards Somnath -Original Message- From: Haomai Wang [mailto:haomaiw...@gmail.com] Sent: Monday, October 12, 2015 11:35 PM To: Somnath Roy Cc: Mark Nelson; ceph-devel; ceph-us...@lists.ceph.com Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results On Tue, Oct 13, 2015 at 12:18 PM, Somnath Roy <somnath@sandisk.com> wrote: > Mark, > > Thanks for this data. This means probably simple messenger (not OSD > core) is not doing optimal job of handling memory. > > > > Haomai, > > I am not that familiar with Async messenger code base, do you have an > explanation of the behavior (like good performance with default > tcmalloc) Mark reported ? Is it using lot less thread overall than Simple ? Originally async messenger mainly want to solve with high thread number problem which limited the ceph cluster size. High context switch and cpu usage caused by simple messenger under large cluster. Recently we have memory problem discussed on ML and I also spend times to think about the root cause. Currently I would like to consider the simple messenger's memory usage is deviating from the design of tcmalloc. Tcmalloc is aimed to provide memory with local cache, and it also has memory control among all threads, if we have too much threads, it may let tcmalloc busy with memory lock contention. Async messenger uses thread pool to serve connections, it make all blocking calls in simple messenger async. > > Also, it seems Async messenger has some inefficiencies in the io path > and that’s why it is not performing as well as simple if the memory > allocation stuff is optimally handled. Yep, simple messenger use two threads(one for read, one for write) to serve one connection, async messenger at most have one thread to serve one connection and multi connection will share the same thread. Next, I would like to have several plans to improve performance: 1. add poll mode support, I hope it can help enhance high performance storage need 2. add load balance ability among worker threads 3. move more works out of messenger thread. > > Could you please send out any documentation around Async messenger ? I > tried to google it , but, not even blueprint is popping up. > > > > > > Thanks & Regards > > Somnath > > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf > Of Haomai Wang > Sent: Monday, October 12, 2015 7:57 PM > To: Mark Nelson > Cc: ceph-devel; ceph-us...@lists.ceph.com > Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger > vs AsyncMessenger results > > > > COOL > > > > Interesting that async messenger will consume more memory than simple, > in my mind I always think async should use less memory. I will give a > look at this > > > > On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson <mnel...@redhat.com> wrote: > > Hi Guy, > > Given all of the recent data on how different memory allocator > configurations improve SimpleMessenger performance (and the effect of > memory allocators and transparent hugepages on RSS memory usage), I > thought I'd run some tests looking how AsyncMessenger does in > comparison. We spoke about these a bit at the last performance meeting but > here's the full write up. > The rough conclusion as of right now appears to be: > > 1) AsyncMessenger performance is not dependent on the memory allocator > like with SimpleMessenger. > > 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB > (ie > default) thread cache. > > 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K > random reads. > > 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory > allocator optimizations are used. > > 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. > > Here's a link to the paper: > > https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view > > Mark > ___ > ceph-users mailing list > ceph-us...@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > > Best Regards, > > Wheat > > > > > PLEASE NOTE: The information contained in this electronic mail message > is intended only for the use of the designated recipient(s) named > above. If the reader of this message is not the intended recipient, > you are hereby notified that you have received this message in error &g
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
On Tue, Oct 13, 2015 at 12:18 PM, Somnath Roy <somnath@sandisk.com> wrote: > Mark, > > Thanks for this data. This means probably simple messenger (not OSD core) is > not doing optimal job of handling memory. > > > > Haomai, > > I am not that familiar with Async messenger code base, do you have an > explanation of the behavior (like good performance with default tcmalloc) > Mark reported ? Is it using lot less thread overall than Simple ? Originally async messenger mainly want to solve with high thread number problem which limited the ceph cluster size. High context switch and cpu usage caused by simple messenger under large cluster. Recently we have memory problem discussed on ML and I also spend times to think about the root cause. Currently I would like to consider the simple messenger's memory usage is deviating from the design of tcmalloc. Tcmalloc is aimed to provide memory with local cache, and it also has memory control among all threads, if we have too much threads, it may let tcmalloc busy with memory lock contention. Async messenger uses thread pool to serve connections, it make all blocking calls in simple messenger async. > > Also, it seems Async messenger has some inefficiencies in the io path and > that’s why it is not performing as well as simple if the memory allocation > stuff is optimally handled. Yep, simple messenger use two threads(one for read, one for write) to serve one connection, async messenger at most have one thread to serve one connection and multi connection will share the same thread. Next, I would like to have several plans to improve performance: 1. add poll mode support, I hope it can help enhance high performance storage need 2. add load balance ability among worker threads 3. move more works out of messenger thread. > > Could you please send out any documentation around Async messenger ? I tried > to google it , but, not even blueprint is popping up. > > > > > > Thanks & Regards > > Somnath > > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of > Haomai Wang > Sent: Monday, October 12, 2015 7:57 PM > To: Mark Nelson > Cc: ceph-devel; ceph-us...@lists.ceph.com > Subject: Re: [ceph-users] Initial performance cluster SimpleMessenger vs > AsyncMessenger results > > > > COOL > > > > Interesting that async messenger will consume more memory than simple, in my > mind I always think async should use less memory. I will give a look at this > > > > On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson <mnel...@redhat.com> wrote: > > Hi Guy, > > Given all of the recent data on how different memory allocator > configurations improve SimpleMessenger performance (and the effect of memory > allocators and transparent hugepages on RSS memory usage), I thought I'd run > some tests looking how AsyncMessenger does in comparison. We spoke about > these a bit at the last performance meeting but here's the full write up. > The rough conclusion as of right now appears to be: > > 1) AsyncMessenger performance is not dependent on the memory allocator like > with SimpleMessenger. > > 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB (ie > default) thread cache. > > 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K > random reads. > > 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory > allocator optimizations are used. > > 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. > > Here's a link to the paper: > > https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view > > Mark > ___ > ceph-users mailing list > ceph-us...@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > > Best Regards, > > Wheat > > > > > PLEASE NOTE: The information contained in this electronic mail message is > intended only for the use of the designated recipient(s) named above. If the > reader of this message is not the intended recipient, you are hereby > notified that you have received this message in error and that any review, > dissemination, distribution, or copying of this message is strictly > prohibited. If you have received this communication in error, please notify > the sender by telephone or e-mail (as shown above) immediately and destroy > any and all copies of this message in your possession (whether hard copies > or electronically stored copies). > -- Best Regards, Wheat -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
Hi Haomai, Great! I haven't had a chance to dig in and look at it with valgrind yet, but if I get a chance after I'm done with newstore fragment testing and somnath's writepath work I'll try to go back and dig in if you haven't had a chance yet. Mark On 10/12/2015 09:56 PM, Haomai Wang wrote: resend On Tue, Oct 13, 2015 at 10:56 AM, Haomai Wangwrote: COOL Interesting that async messenger will consume more memory than simple, in my mind I always think async should use less memory. I will give a look at this On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson wrote: Hi Guy, Given all of the recent data on how different memory allocator configurations improve SimpleMessenger performance (and the effect of memory allocators and transparent hugepages on RSS memory usage), I thought I'd run some tests looking how AsyncMessenger does in comparison. We spoke about these a bit at the last performance meeting but here's the full write up. The rough conclusion as of right now appears to be: 1) AsyncMessenger performance is not dependent on the memory allocator like with SimpleMessenger. 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB (ie default) thread cache. 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K random reads. 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory allocator optimizations are used. 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. Here's a link to the paper: https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view Mark ___ ceph-users mailing list ceph-us...@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Best Regards, Wheat -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
On Tue, 13 Oct 2015, Haomai Wang wrote: > resend > > On Tue, Oct 13, 2015 at 10:56 AM, Haomai Wangwrote: > > COOL > > > > Interesting that async messenger will consume more memory than simple, in my > > mind I always think async should use less memory. I will give a look at this Yeah.. I was surprised to see this as well. The other conclusions are quite promising, though! Note that we still have a few outstanding issues with async msgr that cropped up during the infernalis testing, so for now we're doing just simplemessenger to get infernalis out the door. That gives us the balance of this next cycle until Jewel to shake out the remaining issues so that hopefully we can make this the default for Jewel! sage > > > > On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson wrote: > >> > >> Hi Guy, > >> > >> Given all of the recent data on how different memory allocator > >> configurations improve SimpleMessenger performance (and the effect of > >> memory > >> allocators and transparent hugepages on RSS memory usage), I thought I'd > >> run > >> some tests looking how AsyncMessenger does in comparison. We spoke about > >> these a bit at the last performance meeting but here's the full write up. > >> The rough conclusion as of right now appears to be: > >> > >> 1) AsyncMessenger performance is not dependent on the memory allocator > >> like with SimpleMessenger. > >> > >> 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB (ie > >> default) thread cache. > >> > >> 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K > >> random reads. > >> > >> 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory > >> allocator optimizations are used. > >> > >> 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. > >> > >> Here's a link to the paper: > >> > >> https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view > >> > >> Mark > >> ___ > >> ceph-users mailing list > >> ceph-us...@lists.ceph.com > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > > -- > > > > Best Regards, > > > > Wheat > > > > -- > Best Regards, > > Wheat > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [ceph-users] Initial performance cluster SimpleMessenger vs AsyncMessenger results
resend On Tue, Oct 13, 2015 at 10:56 AM, Haomai Wangwrote: > COOL > > Interesting that async messenger will consume more memory than simple, in my > mind I always think async should use less memory. I will give a look at this > > On Tue, Oct 13, 2015 at 12:50 AM, Mark Nelson wrote: >> >> Hi Guy, >> >> Given all of the recent data on how different memory allocator >> configurations improve SimpleMessenger performance (and the effect of memory >> allocators and transparent hugepages on RSS memory usage), I thought I'd run >> some tests looking how AsyncMessenger does in comparison. We spoke about >> these a bit at the last performance meeting but here's the full write up. >> The rough conclusion as of right now appears to be: >> >> 1) AsyncMessenger performance is not dependent on the memory allocator >> like with SimpleMessenger. >> >> 2) AsyncMessenger is faster than SimpleMessenger with TCMalloc + 32MB (ie >> default) thread cache. >> >> 3) AsyncMessenger is consistently faster than SimpleMessenger for 128K >> random reads. >> >> 4) AsyncMessenger is sometimes slower than SimpleMessenger when memory >> allocator optimizations are used. >> >> 5) AsyncMessenger currently uses far more RSS memory than SimpleMessenger. >> >> Here's a link to the paper: >> >> https://drive.google.com/file/d/0B2gTBZrkrnpZS1Q4VktjZkhrNHc/view >> >> Mark >> ___ >> ceph-users mailing list >> ceph-us...@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > -- > > Best Regards, > > Wheat -- Best Regards, Wheat -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html