search for: jemalloc

On 12 August 2017 at 15:10, luke-tierney at uiowa.edu wrote: | As the Python posts poitns out, it is possible to use alternate malloc | implementations, either rebuilding R to use them or using LD_PRELOAD. | On Ubuntu for example, you can have R use jemalloc with | | sudo apt-get install libjemalloc1 | env LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1 R | | This does not seem to hold onto memory to the same degree, but I don't | know about any other aspect of its performance. Interesting. I don't really know anything about malloc ve...

...e a problem if libc > > would use mmap() as the low-level allocator for malloc but it > > doesn't. It uses sbrk() mostly for small (<128k) allocations, and > > even with mmaps it caches them for a while. > > Recommended reading: > http://people.freebsd.org/~jasone/jemalloc/bsdcan2006/jemalloc.pdf If jemalloc provides same or better memory usage than MMapAllocator, I think it'd be better to have a JEMallocAllocator instead. I think jemalloc is fairly portable (firefox uses it), isn't it? > > > I think that is because mmap() is slow in multithreaded...

HI, all My daemon exists a libvirt API call: virEventRegisterDefaultImpl(); once I called the virEventRegisterDefaultImpl() ,must be core ,the bt stack is: (gdb) bt #0 free (ptr=0x1) at include/jemalloc/internal/arena.h:652 #1 0x00007f57690a488a in virFree () from /lib64/libvirt.so.0 #2 0x00007f57690c3562 in virResetError () from /lib64/libvirt.so.0 #3 0x00007f57690c49ad in virEventRegisterDefaultImpl () from /lib64/libvirt.so.0 #4 0x00000000004029ad in main (argc=<optimized out>, argv=&...

Very interesting information about switching glibc malloc to jemalloc. So I see action plan as following: 1. set up some benchmark (need to think about design) 2. Run it on ubuntu machine with default glibc malloc 3. Run it with malloc_trim passed with reg.finalizer() 4. Run it with jemalloc 5. Review results and if they will look better than with gl...

...;> > would use mmap() as the low-level allocator for malloc but it >> > doesn't. It uses sbrk() mostly for small (<128k) allocations, and >> > even with mmaps it caches them for a while. >> >> Recommended reading: >> http://people.freebsd.org/~jasone/jemalloc/bsdcan2006/jemalloc.pdf > > If jemalloc provides same or better memory usage than > MMapAllocator, I think it'd be better to have a JEMallocAllocator > instead. > I think jemalloc is fairly portable (firefox uses it), isn't it? Reading the abstract, jemalloc seems like it ha...

...EDT Dirk Eddelbuettel wrote: > On 12 August 2017 at 15:10, luke-tierney at uiowa.edu wrote: > | As the Python posts poitns out, it is possible to use alternate malloc > | implementations, either rebuilding R to use them or using LD_PRELOAD. > | On Ubuntu for example, you can have R use jemalloc with > | > | sudo apt-get install libjemalloc1 > | env LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.1 R > | > | This does not seem to hold onto memory to the same degree, but I don't > | know about any other aspect of its performance. > > Interesting. > &gt...

...allocated. That wouldn't be a problem if libc would > use mmap() as the low-level allocator for malloc but it doesn't. > It uses sbrk() mostly for small (<128k) allocations, and even with > mmaps it caches them for a while. Recommended reading: http://people.freebsd.org/~jasone/jemalloc/bsdcan2006/jemalloc.pdf > I think that is because mmap() is slow in multithreaded apps, since it > needs to take a process level lock, which also contends with the lock > taken by pagefaults from other existing mmaps (in fact that lock is held > during disk I/O!). Sounds awesome, let&...

...; - glibc's malloc is happy to allocate more than PTRDIFF_MAX bytes (and > this is important in practice so (at least some) glibc devs are reluctant > to "fix" it); > glibc is not the only game in town. Android prevents it: https://android-review.googlesource.com/#/c/170800/ jemalloc prevents it: https://github.com/jemalloc/jemalloc/commit/0c516a00c4cb28cff55ce0995f756b5aae074c9e There are other implementations of malloc which also act similarly. > - clang has a compile-time limit for sizes of objects and types which is > SIZE_MAX. For example, it compiles "char a...

On Mon, 9 Aug 2010 09:36:53 -0700 Jakob Stoklund Olesen <stoklund at 2pi.dk> wrote: > > On Aug 8, 2010, at 9:20 PM, Reid Kleckner wrote: > > > I thought I dug into the register allocation code, and found the > > VNInfo::Allocator typedef. I assumed that was getting the traffic > > we saw in Instruments, but I don't have the data to back that up. > >

On 2016-05-20 19:58, David Majnemer via llvm-dev wrote: > I've come across this issue before and came to the following conclusion: > - We are not obligated to support objects that large, C11 5.2.4.1/1 only > requires that we support objects of size 65535! Right, the standard doesn't require it. But I guess you don't imply that it's fine for clang to silently miscompile

Strange because in my all my experiments calling malloc.trim always helped - memory reported by top decreased to the level it supposed to be. Do you have in mind case when calling malloc.trim won't do anything? Also shouldn't MALLOC_TRIM_THRESHOLD_ env variable has impact on malloc.trim calls? At the moment seems any value is ignored... 12 ???. 2017 ?. 6:09 ?? ???????????? "Simon

Hello Maksim, On Fri, Oct 18, 2019 at 10:57 AM Maksim Panchenko <maks at fb.com> wrote: > Cool. The new numbers look good. If you run BOLT with jemalloc library > > preloaded, you will likely get a runtime closer to 1 minute. We’ve noticed > that > > compared to the default malloc, it improves the multithreaded > > performance and brings down memory usage significantly. > Great, thanks for confirming! Would you be willing...

...w.so | grep -iE "my|maria" libmysqlclient.so.18 => /usr/lib64/mysql/libmysqlclient.so.18 (0x00007f3dfb34c000) You have new mail in /var/spool/mail/root [root at ec-ast yum.repos.d]# repoquery -l MariaDB-server MariaDB-client MariaDB-commo MariaDB-shared galera boost-program-options jemalloc rsync lsof | grep lib64 | grep libmysqlclient /usr/lib64/libmysqlclient.so /usr/lib64/libmysqlclient.so.18 /usr/lib64/libmysqlclient.so.18.0.0 /usr/lib64/libmysqlclient_r.so /usr/lib64/libmysqlclient_r.so.18 /usr/lib64/libmysqlclient_r.so.18.0.0 ...notice the change in the path (/usr/lib64/mysql/)...

...a here > return r; > } You have still completely failed to explain why __alloc() is better than malloc(). If you wish to implement a language-specific allocator like this, then why would it want to call __alloc() from your hypothetical library instead of malloc(), provided by something like jemalloc(), which has over a decade of careful optimisation behind it to ensure that it scales well on multithreaded systems? > This function will be included in the runtime library. Obviously this is a stupid example maybe a better implementation can be done. Again, why would I, as the author of a hig...

...imple reason: no one asked for it previously. And as we like to say > in > > the open-source community: "patches are welcome." > > > > Maksim > > > > P.S. We have updated https://github.com/facebookincubator/BOLT with > instructions on running BOLT with jemalloc or tcmalloc. > > > > On 10/18/19, 11:21 AM, "Sriraman Tallam" <tmsriram at google.com> wrote: > > > > Hello Maksim, > > > > On Fri, Oct 18, 2019 at 10:57 AM Maksim Panchenko <maks at fb.com> wrote: > > Cool. The new numbers look good....

...turn r; >> } > > You have still completely failed to explain why __alloc() is better than malloc(). If you wish to implement a language-specific allocator like this, then why would it want to call __alloc() from your hypothetical library instead of malloc(), provided by something like jemalloc(), which has over a decade of careful optimisation behind it to ensure that it scales well on multithreaded systems? > >> This function will be included in the runtime library. Obviously this is a stupid example maybe a better implementation can be done. > > Again, why would I, as...

Removing silly virtio-dev@ list because it's bouncing mail... On 12/07/2016 08:21 AM, David Hildenbrand wrote: >> Li's current patches do that. Well, maybe not pfn/length, but they do >> take a pfn and page-order, which fits perfectly with the kernel's >> concept of high-order pages. > > So we can send length in powers of two. Still, I don't see any

Removing silly virtio-dev@ list because it's bouncing mail... On 12/07/2016 08:21 AM, David Hildenbrand wrote: >> Li's current patches do that. Well, maybe not pfn/length, but they do >> take a pfn and page-order, which fits perfectly with the kernel's >> concept of high-order pages. > > So we can send length in powers of two. Still, I don't see any

...lib64/libmyodbc5w.so | grep -iE > "my|maria" > libmysqlclient.so.18 => /usr/lib64/mysql/libmysqlclient.so.18 > (0x00007f3dfb34c000) > [root at ec-ast yum.repos.d]# repoquery -l MariaDB-server MariaDB-client > MariaDB-commo MariaDB-shared galera boost-program-options jemalloc rsync > lsof | grep lib64 | grep libmysqlclient > /usr/lib64/libmysqlclient.so.18 If the MariaDB packages provide the library in /usr/lib64, what provides the lib in /usr/lib64/mysql?? (It looks like you have a library conflict) rpm -qf /usr/lib64/mysql/* More than likely, you can resolve...

Hello Maksim, On Wed, Oct 16, 2019 at 3:52 PM Maksim Panchenko <maks at fb.com> wrote: > Hi Sri, > > > > I want to clarify one thing before sending a detailed reply: did you > evaluate > > BOLT on Clang built with basic block sections? > In the makefile you reference, > > there are two versions: a “vanilla” and a default built with function > sections.