search for: drop_cache

...low performances. For my benches, as you can read below, I do some actions (untar, du, find, tar, rm) with linux kernel sources, dropping cache, each on distributed, replicated, distributed-replicated, single (single brick) volumes and the native FS of one brick. # time (echo 3 > /proc/sys/vm/drop_caches; tar xJf ~/linux-4.1-rc5.tar.xz; sync; echo 3 > /proc/sys/vm/drop_caches) # time (echo 3 > /proc/sys/vm/drop_caches; du -sh linux-4.1-rc5/; echo 3 > /proc/sys/vm/drop_caches) # time (echo 3 > /proc/sys/vm/drop_caches; find linux-4.1-rc5/|wc -l; echo 3 > /proc/sys/vm/drop_caches) # t...

...benches, as you can read below, I do some actions (untar, du, > find, tar, rm) with linux kernel sources, dropping cache, each on > distributed, replicated, distributed-replicated, single (single brick) > volumes and the native FS of one brick. > > # time (echo 3 > /proc/sys/vm/drop_caches; tar xJf > ~/linux-4.1-rc5.tar.xz; sync; echo 3 > /proc/sys/vm/drop_caches) > # time (echo 3 > /proc/sys/vm/drop_caches; du -sh linux-4.1-rc5/; echo > 3 > /proc/sys/vm/drop_caches) > # time (echo 3 > /proc/sys/vm/drop_caches; find linux-4.1-rc5/|wc -l; > echo 3 > /...

...ge cache. One solution is to move the page cache to the hypervisor, e.g., using emulated NVDIMMs or virtio-pmem. > Would it be possible?to add a mechanism that explicitly causes page > cache to shrink without requiring the system to be under memory pressure? > We do have a sysctl "drop_caches" which calls iterate_supers(drop_pagecache_sb, NULL) and drop_slab(). doc/Documentation/sysctl/vm.txt: ============================================================== drop_caches Writing to this will cause the kernel to drop clean caches, as well as reclaimable slab objects like dentries an...

Was there some reason that patch got dropped? Otherwise rsync eats up all the buffer memory. Note -- I tried directio -- didn't work due to alignment issues -- buffers have to be aligned to sectors. The kernel, if I remember correctly, has been on again/off again on requiring alignment on directio -- because most of the drivers and devices do for directio to work, at. "dd"

Hello, I have found, that ocfs2 is very slow when doing I/O operation without cache. See a simple test: ng-vvv1:~# dd if=/data/verejna/dd-1G bs=1k | dd of=/dev/null 1048576+0 records in 1048576+0 records out 1073741824 bytes (1.1 GB) copied, 395.183 s, 2.7 MB/s 2097152+0 records in 2097152+0 records out 1073741824 bytes (1.1 GB) copied, 395.184 s, 2.7 MB/s The underlying block device is quite

On Fri, Oct 04, 2019 at 10:06:03AM +0200, David Hildenbrand wrote: > On 04.10.19 01:15, Tyler Sanderson wrote: > > I was mistaken, the problem with overcommit accounting is not fixed by > > the change to shrinker interface. > > This means that large allocations are stopped even if they could succeed > > by deflating the balloon. > > Please note that some people

On Fri, Oct 04, 2019 at 10:06:03AM +0200, David Hildenbrand wrote: > On 04.10.19 01:15, Tyler Sanderson wrote: > > I was mistaken, the problem with overcommit accounting is not fixed by > > the change to shrinker interface. > > This means that large allocations are stopped even if they could succeed > > by deflating the balloon. > > Please note that some people

On Thursday, February 6, 2020 5:10 PM, David Hildenbrand wrote: > so dropping caches (echo 3 > /proc/sys/vm/drop_caches) will no longer > deflate the balloon when conservative_shrinker=true? > Should be. Need Tyler's help to test it. Best, Wei

On Thursday, February 6, 2020 5:10 PM, David Hildenbrand wrote: > so dropping caches (echo 3 > /proc/sys/vm/drop_caches) will no longer > deflate the balloon when conservative_shrinker=true? > Should be. Need Tyler's help to test it. Best, Wei

...lusterfs-3.3.1-1.el6.x86_64.rpm rpms. I am seeing the Committed_AS memory continually increasing and the processes using the memory are glusterfsd instances. see http://imgur.com/K3dalTW for graph. Both nodes are exhibiting the same behaviour, I have tried the suggested echo 2 > /proc/sys/vm/drop_caches but it made no difference. It there a known issue with 3.3.1 ? Thanks John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20130911/0b9be3d7/attachment.html>

...cfs2_initialize_super+0x55e/0xd7f [ocfs2] size-512: 26439 ocfs2_dentry_attach_lock+0x2d1/0x423 [ocfs2] ocfs2_inode_cache: 26450 ocfs2_alloc_inode+0x13/0x29 [ocfs2] size-512: 52879 dlm_new_lockres+0x22/0x189 [ocfs2_dlm] # Clear caches [root@lnxp-1038:/mail/store/backend1]$ echo 3 > /proc/sys/vm/drop_caches [root@lnxp-1038:/mail/store/backend1]$ echo 0 > /proc/sys/vm/drop_caches [root@lnxp-1038:/backend1]$ cat /proc/slab_allocators | egrep '(size.512|ocfs2_inode_cache)' | grep ocfs | sort -k 2 -n size-512: 1 o2hb_heartbeat_group_make_item+0x1b/0x79 [ocfs2_nodemanager] size-512: 1 o2hb_m...

...eat improvement with the second "ls -lR". echo 'y'|mkfs.ocfs2 -b 4K -C 4K -M local /dev/sda11 mount -t ocfs2 /dev/sda11 /mnt/ocfs2/ time tar jxvf /home/taoma/linux-2.6.28.tar.bz2 -C /mnt/ocfs2/ 1>/dev/null real 0m20.548s 0m20.106s umount /mnt/ocfs2/ echo 2 > /proc/sys/vm/drop_caches mount -t ocfs2 /dev/sda11 /mnt/ocfs2/ time ls -lR /mnt/ocfs2/ 1>/dev/null real 0m13.965s 0m13.766s umount /mnt/ocfs2/ echo 2 > /proc/sys/vm/drop_caches mount -t ocfs2 /dev/sda11 /mnt/ocfs2/ time rm /mnt/ocfs2/linux-2.6.28/ -rf real 0m13.198s 0m13.091s umount /mnt/ocfs2/ echo 2 > /proc...

On Thursday, February 6, 2020 5:32 PM, David Hildenbrand wrote: > > If the page cache is empty, a drop_slab() will deflate the whole balloon if I > am not wrong. > > Especially, a echo 3 > /proc/sys/vm/drop_caches > > will first drop the page cache and then drop_slab() Then that's the problem of "echo 3 > /proc/sys/vm/drop_cache" itself. It invokes other shrinkers as well (if considered an issue), need to be tweaked in the mm. Best, Wei

...char *device) > +{ > + return bmap_prepare (device, device); > +} > + > +static char buffer[BUFSIZ]; > + > +int > +do_bmap (void) > +{ > + size_t n; > + ssize_t r; > + struct dirent *d; > + > + /* Drop caches before starting the read. */ > + if (do_drop_caches (3) == -1) > + return -1; > + > + if (fd >= 0) { > + n = statbuf.st_size; > + > + while (n > 0) { > + r = read (fd, buffer, n > BUFSIZ ? BUFSIZ : n); > + if (r == -1) { > + reply_with_perror ("read"); > + close (fd)...

...m overhead for applications with high memory demands. We have seen a 50% slowdown or worse for applications. Even High Performance Linpack, that have no file IO whatsoever is affected. The only remedy seems to be to empty the buffer cache from memory by running "echo 3 > /proc/sys/vm/drop_caches" Any hints on how to improve the situation is greatly appreciated. System setup: Client: Dual socket Sandy Bridge, with 32GB ram and infiniband connection to lustre server. CentOS 6.4, with kernel 2.6.32-358.11.1.el6.x86_64 and lustre v2.1.6 rpms downloaded from whamcloud download site....

On Monday, February 10, 2020 11:57 AM, Tetsuo Handa wrote: > Then, "node-A's NR_FILE_PAGES is already 0 and node-B's NR_FILE_PAGES is > not 0, but allocation request which triggered this shrinker wants to allocate > from only node-A" > would be confused by this change, for the pagecache pages for allocating > thread's interested node are already depleted but

On Monday, February 10, 2020 11:57 AM, Tetsuo Handa wrote: > Then, "node-A's NR_FILE_PAGES is already 0 and node-B's NR_FILE_PAGES is > not 0, but allocation request which triggered this shrinker wants to allocate > from only node-A" > would be confused by this change, for the pagecache pages for allocating > thread's interested node are already depleted but

Hi ocfs2 developers, there are some news about the schedule for a new ocfs2 release that solve the actual bug/limitations? I can see an 1.4.7 release tagged here: http://oss.oracle.com/git/?p=ocfs2-1.4.git;a=summary Is there a planned release date? in my environment (about 5000000 files with 300000 new files/deletion per day) I see load until 1000 and I/O almost blocked for some hours of the

Hi @all! Sorry about that many questions, but after searching and reading tons different web sites, I didn't find exactly what I am searching for. So, I know that with the -z Option rsync compresses the files with gzip, than the files are transfared and at the target machine uncompressed. I want to know, is there a possibility to see how big the compressed file is, which rsync generates

Hi all, I''m a newbie on this list. I''m using xen 3.0.3 on CentOS50. I installed a new flavor of kernel in a domU via a standard RPM, which modified my grub.conf by adding a new entry to boot on the new kernel. When rebooting the domU by pygrub, I didn''t see the new grub entry. I tried to restart xend, with no effect. By googling a little, I understood that kernel