search for: nocach

...nozero and noextents filters, add a filter to make it easy to override the basic caching functionality, in part to facilitate timing tests of whether a plugin's cache implementation is worthwhile. A worthwhile test to add to the testsuite would connect the log filter both before and after the nocache filter, to prove how caching requests are altered. However, until we use libnbd in the nbdkit testsuite, there isn't really a clean way to trigger NBD_CMD_CACHE calls to test this (qemu-nbd can't do it). But I can at least exploit test-eflags to use 'qemu-nbd --list' to demonstrat...

Hi list, Recently I was debugging L2 guest slow booting issue in nested virtualization environment (both L0 and L1 hypervisors are all Xen). To boot a L2 Linux guest (RHEL6u2), it will need to wait more than 3 minutes after grub loaded, I did some profile, and see guest is doing disk operations by int13 BIOS procedure. Even not consider the nested case, I saw there is a bug reporting normal VM

Being able to programmatically force nbdkit to be less parallel can be useful during testing. I was less sure about patch 3, but if you like it, I'm inclined to instead squash it into patch 1. This patch is written to apply after my NBD_CMD_CACHE work (since I touched the nocache filter); but can be rearranged if we think this series should go in first while that one undergoes any adjustments from review. Eric Blake (3): server: Allow filters to reduce thread model dynamically noparallel: Implement new filter filters: Use only .thread_model, not THREAD_MODEL docs/...

...| 48 +++++++++++++++------------------ include/nbdkit-filter.h | 6 ++--- filters/cow/cow.c | 2 -- filters/delay/delay.c | 2 -- filters/error/error.c | 2 -- filters/fua/fua.c | 2 -- filters/log/log.c | 2 -- filters/nocache/nocache.c | 2 -- filters/noextents/noextents.c | 2 -- filters/noparallel/noparallel.c | 2 -- filters/nozero/nozero.c | 2 -- filters/offset/offset.c | 2 -- filters/partition/partition.c | 2 -- filters/rate/rate.c | 2 -- filters/readahead/readahead...

https://bugzilla.samba.org/show_bug.cgi?id=9560 Summary: drop-cache option Product: rsync Version: 3.0.9 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P5 Component: core AssignedTo: wayned at samba.org ReportedBy: colundrum at gmail.com QAContact: rsync-qa at

...che.c | 1 - filters/cacheextents/cacheextents.c | 1 - filters/cow/cow.c | 1 - filters/delay/delay.c | 1 - filters/error/error.c | 1 - filters/fua/fua.c | 1 - filters/log/log.c | 1 - filters/nocache/nocache.c | 1 - filters/noextents/noextents.c | 1 - filters/noparallel/noparallel.c | 1 - filters/nozero/nozero.c | 1 - filters/offset/offset.c | 1 - filters/partition/partition.c | 1 - filters/rate/rate.c | 1 - filter...

...singFields)) + res0 <- cbind(res0, toadd) + } + res0 <- cbind(res0[, fields], Repository = repos) res <- rbind(res, res0) } } @@ -307,22 +319,29 @@ } installed.packages <- - function(lib.loc = NULL, priority = NULL, noCache = FALSE) + function(lib.loc = NULL, priority = NULL, noCache = FALSE, + fields = NULL) { if(is.null(lib.loc)) lib.loc <- .libPaths() - pkgFlds <- c("Version", "Priority", "Bundle", "Contains", "Depends", -...

...w: Implement .cache delay: Implement .cache error: Implement .cache log: Implement .cache offset, partition: Implement .cache readahead, xz: Implement .can_cache via emulation stats: Implement .cache truncate: Implement .cache filters: Pass through .can_cache for remaining filters nocache: Implement new filter docs/nbdkit-filter.pod | 42 +++++-- docs/nbdkit-plugin.pod | 82 +++++++++++++ docs/nbdkit-protocol.pod | 8 ++ filters/cache/nbdkit-cache-filter.pod | 6 +- filters/cow/nbdkit-cow-filter.pod...

...orm>";   if(isset($_GET['N'])) {   $N = $_GET['N'];     // execute R script from shell   // this will save a plot at temp.png to the filesystem   exec("C:\Program Files\R\R-3.2.0\bin\x64\my_rscript.R $N");     // return image tag   $nocache = rand();   echo("<img src='temp.png?$nocache' />"); } ?> Codigo R:  args <- commandArgs(TRUE)   N <- args[1] x <- rnorm(N,0,1)   png(filename="temp.png", width=500, height=500) hist(x, col="lightblue")...

...erent things in the current code. Flushing after every write is almost never needed, but if needed it should be possible to use it without fadvice=DONTNEED to keep a useful cache when reading. I think the DONTNEED flag should be separate from cache=writesthrough. In dd this can be done using iflag=nocache or oflag=nocache, and syncing after every write can be done using oflag=dsync/sync. If you want both you can use oflag=nocache,dsync. > I'm not convinced by this change. cache=none should mean no cache, and it should not require syncing after every write. What we have now is not useful....

On Fri, Aug 07, 2020 at 05:29:24PM +0300, Nir Soffer wrote: > On Fri, Aug 7, 2020 at 5:07 PM Richard W.M. Jones <rjones@redhat.com> wrote: > > These ones? > > https://www.redhat.com/archives/libguestfs/2020-August/msg00078.html > > No, we had a bug when copying image from glance caused sanlock timeouts > because of the unpredictable page cache flushes. > > We

...ved since the stream > stopped > suddenly. The only thing that comes to mind is that your URL should be > unique per every stream instance (like if Icecast stops streaming then > starts again, generate a unique URL.) > > Take a look at this: > https://impactjs.com/forums/help/nocache-how-to-force-user-page-to-refresh-in-order-to-load-my-updated-changes/page/1 > > > Cheers, > Jordan > _______________________________________________ > Icecast mailing list > Icecast at xiph.org > http://lists.xiph.org/mailman/listinfo/icecast

...e bug I mentioned is: https://bugzilla.redhat.com/1832967 This explains the issue: https://bugzilla.redhat.com/1247135#c29 And here you can how unrelated I/O is affected by uncontrolled flushes: https://bugzilla.redhat.com/1247135#c30 https://bugzilla.redhat.com/1247135#c36 Here we compare oflag=nocache,dsync with oflag=direct for NFS and iSCSI disks: https://gerrit.ovirt.org/c/108912/ cahe=none now is basically oflag=nocache,dsync > > Rich. > > -- > Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones > Read my programming and virtualization blog: htt...

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"

...ike there is a buglet in 'installed.packages', around line 17: for (lib in lib.loc) { dest <- file.path(tempdir(), paste("libloc_", URLencode(lib,=20 TRUE), paste(fields, collapse =3D ","), ".rds", sep =3D "")) if (!noCache && file.exists(dest) && file.info(dest)$mtime >=20 file.info(lib.loc)$mtime) { ^^^^^^^ =20 The 'lib.loc' should be 'lib', otherwise the comparison is always against t= he first library in 'lib.loc',...

This is... odd. >From my workstation, where I'm directly logged in, if I ssh to any CentOS 7 box, as myself, and try to run man, it fails. Example 1: man dd man: cannot write to /var/cache/man/cat1/dd.1.gz in catman mode dd. Example 2: man dd man: can't chmod (null): Bad address man: can't unlink (null): Bad address dd. In all cases, if I sudo -s to root, I have no trouble

Hello Icecast, I have successfully done a test audio stream to the free, "Icecast," server. However, when I stop my audio source, after some seconds, eg, ten, then once that audio stream has finished, after about six seconds the audio stream repeats playing, then does so after the same time interval, again for many times. Each time the volume of these repetitions, decreases. Even

Hi all. I am trying to find a way to insert an authenticity_token into the params of an Ajax request before it gets sent. I''ve got this much: Ajax.Responders.register({ onLoading: function(req){ if ((req.options.method == ''post'') && ! Object.keys(req.options.parameters).include(''authenticity_token'')){ ---->

...uired to use direct I/O is IMO a ridiculous hack. What happens if some other process on the same machine happens to block the NFS server by writing lots? Perhaps the admin installs some proprietary backup software that we are unable to modify? Same thing would happen. > Here we compare oflag=nocache,dsync with oflag=direct for NFS and iSCSI disks: > https://gerrit.ovirt.org/c/108912/ > > cahe=none now is basically oflag=nocache,dsync Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.word...

...filters/ext2/Makefile.am | 3 ++- filters/extentlist/Makefile.am | 1 + filters/fua/Makefile.am | 3 +++ filters/gzip/Makefile.am | 1 + filters/ip/Makefile.am | 1 + filters/limit/Makefile.am | 1 + filters/log/Makefile.am | 1 + filters/nocache/Makefile.am | 3 +++ filters/noextents/Makefile.am | 3 +++ filters/nofilter/Makefile.am | 3 +++ filters/noparallel/Makefile.am | 3 +++ filters/nozero/Makefile.am | 3 +++ filters/offset/Makefile.am | 1 + filters/partition/Makefile.am | 1 + filters/pause/Mak...