General :: Crontab To Email When Buffers/cache Memory Reached A Defined Value
Jun 18, 2010
I have a Linux server running CentOS with 2GB RAM. I am searching in google and also in this forum but could not find any luck yet. I am searching the way that we can receive notification by system to a specified email when the memory reached a specified value we defined.
Is there any tool or sort of shell script we set via crontab every minute to check that?
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Mar 3, 2010
I'm trying to learn how to send my self an email reminder using crontab, this is what I tried but I'm not getting the email.# m h dom mon dow command 33 13 * * 3 mail -s "This is a test" joedwalker.email@gmail.com < /home/joe/email.
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Jan 11, 2010
let me know how to clear cache memory ( RHEL 5.1 ) as it consumes almost 100% physical memory.
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Jan 8, 2010
I am trying to test a Gigabit Ethernet Tattile line scan camera. I installed the driver properly set the ip of device using utility given in the driver. when i am trying to open the live view of camera using a utility given (tag_show) it gives me error in /var/log/messages TBP ERROR: No buffers available in free buffers list When i looked into the code of utility it is doing ioctl call where it is failing with errno=12.
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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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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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Apr 27, 2010
I am using Linux 64 bit Redhat Linux. I am trying to setup simple crontab as follow...1. Edited crontab file using crontab -e2. Listed the file once to verify it using crontab -l. This will display as.. 18 5 * * 2-3 ksh $HOME/testScript.sh > $HOME/testscript.out3. Logged in a root and restarted cron deamon using "/etc/init.d/crond restart"As per my understanding now my testScript should start running at 5:18 am Thuesday
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Apr 8, 2011
i am using this python code to send an email
Code:
#!/usr/bin/python
import smtplib
sender = 'from@fromdomain.com'
receivers = ['to@todomain.com']
NameError: name 'SMTPException' is not defined
apparently there is something wrong with /usr/lib/python2.6/smtplib.py but i cant make it out
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Jul 28, 2010
I would like to make a crontab task to email a log file to me every night.
How would i do this? I know how to make crontab jobs (and sett the time on them), i just dont know the command i would write for this particular job.
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Aug 3, 2011
I've currently got a crontab line that looks like the following:
Code:
*/5 * * * * /usr/bin/php -q /etc/backend/cron.php | mail -s "Cron script output" whiteydude@gmail.com
The script works fine - it runs every 5 minutes and checks if certain environmental variables are set in place - if they are, it prints an output. If they're not, it dies.
The problem is that when it dies, it still sends me a blank email - one every 5 minutes, every time the cron job runs.
telling it not to send if it's blank?
I'm assuming some type of dirty awk script could do this, but I don't really know my shell well enough to do that.
I'm not good at putting these things into words, so let me write some psuedo code to explain what I mean:
Code:
*/5 * * * * /usr/bin/php -q /etc/backend/cron.php | if (STDOUT != '') { mail -s "Cron script output" whiteydude@gmail.com }
EDIT: Unfortunately I'm running on CentOS, so I can't use mail -E . Apparently that's a FreeBSD thing.
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Jan 24, 2010
I read somewhere that i can clean cache memory with this comand:
Code:
david@lap:~$ 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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Mar 12, 2011
I've installed my debian sid about one month ago (first xfce, next gnome) but noticed that it's kind of really slow. The upgrades take ages, launching (and using) firefox takes so much time,... In comparaison to my ubuntu, archlinux (on the same computer) or previous installation of debian there is clearly a problem somewhere.Today I tried to do a "top" sorted by mem usage : 3.5% xulrunner-stub, 2.1% dropbox, 1.4% aptitude (doing upgrade), 1.4% clementine,... nothing terriblebut still I've 2.7Gb or RAM used (more than 50%)
$ free -m
total used free shared buffers cached
Mem: 3967 26851282 0 79 1938
[code]....
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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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Jun 23, 2011
is it possible disabling a crontab job without deleting the crontab description entry (by crontab -e)?I could also accept to change the entry itself. Now it's:0 0 * * 0-6 /home/me/cron/script.csh
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Jun 18, 2010
What it's the difference between buff(ered) and cache portions of memory?
Code:
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Aug 11, 2010
i am running Ubuntu Lucid x64 as a fileserver that shares its files via SFTP, NFS and Samba. Currently the hard disks are configured to go to standby if they are not needed. This works perfectly as long as no one browses the shares or my HTPC is running: That one repeatedly looks through the shares for new music or movies. In other words my problem is that the disks are spinning up a lot more often than they should have to. Additionally the spin-up time delays the response time while browsing. Since the machine has a lot of unused RAM i want to tell the kernel that it should keep the directory structure in memory. That way the disks would not need to spin up every time someone browses through the directories.
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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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Oct 23, 2009
What programs can be used to test and find faulty memory (RAM, Video adapters, cache)?
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Jul 13, 2011
I'm searching monitoring tools which can listen disks, overhead, cache, memory, cpu performance.Can anybody help me?
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Nov 22, 2010
I am reading slab allocator, it defines slab cache, i am quite confuse is it same as hardware cache?
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Jun 19, 2011
On standard Linux setups you have two general paste buffers, the main copy(^C)/paste(^V) one and the select-text/middle-click one. For both of these buffers:
At what level in the environment are these buffers stored/managed; the kernel, the X server, KDE/Gnome, or some other service somewhere? Can they be programmatically accessed somehow using some standard library?
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Jan 20, 2011
I want to know the status of udp received buffer ,before receiving nest packet.Are there any API to know the status of received buffers.
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Jan 11, 2010
As per the documentation of sync [URL] , it schedules the writes but does not necessarily complete the write upon return.
Is there any other way to make sure we sync and it returns after it has written all the buffers to disk?
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Apr 7, 2009
I'm fairly comfortable with emacs but I can't seem to find how to do this. I deal with a lot of text files and find myself performing a lot of regular expression replacements to correct the formatting of the text -- or to extract certain tidbits of data from large ugly-looking files.
I know how to perform a regular expression replacement in one buffer at a time. But how do you perform a regular expression search and replace across all open buffers? I have found a method to perform a regex search and replace across a directory by marking files but I need to do it in the open buffers.
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Mar 30, 2011
I would like to use ulimit -St <some number> to stop a process form running once the process has exceeded the amount of CPU time specified in the ulimt arg.
I have been able to get ulimit -t (or -Ht) to kill my process, but I need the signal to be something other than 9 and other than SIGXCPU.
Is there a way to have ulimit issue a kill -<somthing else> when the cpu time specified has been exceeded?
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Jun 4, 2010
The following recipient(s) cannot be reached:
Im using slack ware 10.2 for may mail server.
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Mar 8, 2011
When I try to delete a file, ( move to trash ) It says , The trash has reached It's maximum size! clean the trash manually. When I click on the trash icon on desktop it is empty. Where is the trash? Where can I delete these files ?
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Mar 27, 2010
Was wondering if anyone can explain briefly the relationship of "cache" and free memory in the "free" memory command.
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Feb 17, 2011
I have standalone Suse 10 SP3 that when I run
Code: # hostname webserver but when I run host command
Code: # host webserver;; connection timed out; no servers could be reached I would like to get the IP when I issue
[Code]....
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May 29, 2011
What is the difference between the crontab located in /etc/crontab and the crontab that can be edited using crontab -e?
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