Ubuntu :: Natty Clears Memory Cache When Screensaver Launches

May 27, 2011

It seems that something is causing the memory cache to be cleared when the screensaver launches. Then when moving the mouse or hitting a key to stop the screensaver it takes forever for the already launched and minimized applications to redisplay. I am using the ubuntu classic desktop.

Now time to rant.

Natty has so many bugs it is impossible to work around them all. This memory issue is one of the worst. The dead zone caused by the static application switcher, and the application switcher plugins for compiz (and probably any override redirect window) is another big one. There is not a single window decorator for compiz that works right. I have encountered two packages with binaries that won't even run (emerald and xpdf). The nvidia drivers seem to have issues (this may be related to this memory clearing issue).

Without a doubt more bugs than any other release of Ubuntu to date. I have worked around most of them by recompiling, and etc., but this is a real pain.

This is all aside from the idiotic switch to unity, when it is clearly not ready for release. The general direction of Ubuntu is really starting to look bad. By the way, what is up with the decision to uglify the desktop with gray scale icons (I know this is an old one, but I haven't really ranted on Ubuntu yet).

Looks like I will have to revert to Maverick.

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Programming :: SHM Memory Counted As Cache Memory With Kernel 2.6.18?

Aug 25, 2010

Is that possible that SHM shared memory is counted as cache memory on Linux with kernel 2.6.18?If find it really odd since this memory is not file backed, but I have a piece of code that loads data using shm_open+mmap, and it generates an amount of cache memory in /proc/meminfo that corresponds exactly to the amount of shared memory (I load that data from a file but I am using posix_fadvise(fd,0,0,POSIX_FADV_DONTNEED) to ensure this file is not cached and I made sure that it is working as expected). As far as I know SHM memory was not tagged as cache memory with kernel 2.6.9.If it is the case it is really unfortunate since normally cache memory can be considered to be part of the "available" memory since it can be flushed promptly but this is clearly not the case with SHM memory... Is there an easy way to get the total amount of used SHM memory on a system?

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Jun 2, 2011

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May 13, 2011

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Ubuntu :: How To Clean The Cache Memory

Jan 24, 2010

I read somewhere that i can clean cache memory with this comand:

Code:

david@lap:~$ sudo echo 3 > /proc/sys/vm/drop_caches
bash: /proc/sys/vm/drop_caches: Permission denied

The problem is that permission is denied as you see...

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Feb 15, 2011

Ubuntu 10.10

How do I clear the System cache memory.

For the past few days , I am facing problem in opening websites (firefox & Chrome).

I have to restart the laptop and then access the web sites.

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Mar 12, 2011

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$ free -m
total used free shared  buffers cached
Mem:  3967 26851282  0 79 1938

[code]....

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Nov 3, 2010

(Ubuntu Linux server, 64-bits)I was troubleshooting a problem with a file (~3.0 GB) which I had just downloaded, but it was failing the integrity test, when I discovered something really unusual.First this is the MD5 of the file after download, which didn't match the expected value:

~% md5sum media.iso
5d74facb904cc1765a468354908a8f34 media.iso

Some time passes, nothing should have changed the file during this time, but when I went to check the file again:

~% md5sum media.iso
a5b97c5016afb39bd67ccfc3fa6ca59e media.iso

This was really unexpected. Since I have a lot of RAM, I suspected this was the effect of caching and something was going awry with it. I decided to retry with the whole file from disk, for my surprise:

~% sudo sysctl -w vm.drop_caches=3 # This linux command invalidates
vm.drop_caches = 3 # everything in the memory cache.
~% md5sum media.iso
2992aa6270f6e1de9154730ed3beedc1 media.iso

I redid it and now it seems to stay consistent, although this still isn't the value I was expecting. Certainly, the contents in memory cache were different from the contents on disk.This is the big problem.To fix the download, I created a torrent on the source machine and opened it in the target machine. Five 1MB chunks out of ~3.0GB failed integrity check. I used the torrent to fix these file chunks and how the file integrity is ok.The problem now is to determine where the data got out-of-sync.

I tested the memory with memtest86+, all but the bit fading test. I was expecting to see some failing memory module, but there wasn't anything. Everything is ok.Filesystem is Ext4, over LVM2, over a 3-disk RAID5 array.Ext4 is considered stable, and if data were inconsistent between disks, mdadm would have warned. But there is nothing in the logs. S.M.A.R.T. error logs are clean, the disks are new (have less than 30 days of "power-on-hours").I'm looking for information about any data-loss bugs in my current kernel (2.6.35), but there doesn't seem to be anything, as far as I looked.what else I could check, or where exactly could be the defect/bug?It is a Ubuntu 10.10 64-bit, Core i7 930, 6 GB non-ECC RAM.

Update: I confirmed that the files are being correctly written to the disk, the pages are being altered after they are read from disk, while in memory. I did a lot more memtests (I left it doing bit fade test overnight),and still nothing. All memory modules seem ok.Some more tests:

~% md5sum media.iso
cc8bcf1ce67ff7704eadc2222650c087 media.iso
~% cp media.iso tmp[code]....(direcat is a version of cat that reads with O_DIRECT, that is, bypassing page cache)There is a clear pattern: it always happens to the 2nd byte in a 16-byte alignment. In that byte, almost always the bit 4 (LSB) flips to one, but there was one instance where bit 2 flipped to zero.

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Code:

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May 9, 2011

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OS only see's 4gb of memory

Quote:

EEE-PC:~$ free -m
total used free shared buffers cached
Mem: 3269 1916 1352 0 118 550
-/+ buffers/cache: 1246 2022

[code]....

Did some more research and find that PAE Kernel is available in 32 bit for Natty but not 64bit. Source Link Here Is there anything that I can do or should I just go back to 32 bit?

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May 13, 2010

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May 19, 2010

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Quote:

Error: Caching enabled but no local cache of //var/cache/yum/updates-newkey/filelists.sqlite.bz2 from updates-newkey

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Feb 17, 2010

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Jan 7, 2011

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