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Questions tagged [memory]

Synonym for: RAM - Acronym for: Random Access Memory, a type of computer data storage.

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Couchbase server is taking too many resources, how to limit them

I'm having issues with the Couchbase resources especially RAM, I know that Couchbase is too aggressive with the CPU usage but I thought that by setting some memory quota for each service is enough so ...
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How to deal with out of memory issues on multi user systems?

When a process tries to allocate more memory than available, it is usually very hard to handle this situation in a good way. In some cases programs might be able to free non-essential memory (e.g. ...
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how to know the right swap size for hadoop Linux machines

we are using many hadoop clusters for now we are using swap size - 16G free -g total used free shared buff/cache available Mem: 125 ...
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1answer
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Are there variations of DDR4 DIMM modules that are pin-incompatible?

This question is motivated by the previous history of DDR2 unbuffered/buffered memory being physically incompatible due to the position of the notch. From what I understand, DDR4 UDIMM (unbuffered) ...
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30 views

Squid docker container configuration and swap

I'm currently running 4 squid container on my VPS. The server is a 1 vCore cpu with only 512 mb ram. I don't need a high percentage of hit rate, i don't need cache at all in fact. Starting from the ...
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1answer
32 views

-bash: fork: Cannot allocate memory on remote server

I have the great -bash: fork: Cannot allocate memory error. Normall I would reboot. But that is not an option. Using only SSH can you imagine some trick I can use? /sbin/shutdown -r now gives the ...
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0answers
42 views

httpd hogging all memory until server crash

The server in question is used for processing data into reports, it has three cron jobs which execute every minute to check the process queue and if anything is found they'll keep running until the ...
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1answer
36 views

identifying RAM rank of a 32gb PC4-2400 DIMM

have a RAM DIMM, sticker says samsung 32GB 2Rx4 PC4-2400T-RA1-11-DC0 and I believe the model number is M393A4K40BB1-CRC0Q S The dimm has chips on both sides, and on a given side it is 2 rows with 5 ...
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Is Committed_AS in /proc/meminfo really the correct number for allocated virtual memory in Linux? It is less than MemTotal-MemAvailable here

I am collecting numbers for monitoring HPC servers and am debating the policy for handing out memory (overcommit or not). I wanted to show users a number on how much virtual memory their processes (...
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1answer
129 views

Python server with Jupyter notebook running out of memory

I am quite new to using servers, but I recently ran into a bottle neck and had to do my computations on the cloud. After 2 weeks of using the server, there seems to be some memory issues. I use the ...
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1answer
74 views

Does fully buffered memory have a different notch position?

I'm working on a server and ordered replacement ECC memory and found that the fully buffered DDR2 to have the notch in a different positions. I wasn't aware what buffered vs unbuffered memory has a ...
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1answer
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issue with server reached max_children setting, consider raising it

I have recently migrated 30 websites from my old server to new one, and now running on nginx as previously was running on apache. Everything works fine for all websites except for 1 website. I don't ...
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2answers
231 views

understand correctly pm.max_children tuning

I have done some investigations and I have found this to calculate and adjust pm.max_children value https://myshell.co.uk/blog/2012/07/adjusting-child-processes-for-php-fpm-nginx/ but for example : ...
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0answers
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Will More vCPU's and RAM Help Protect Against Some Smaller Scale DDoS Attacks?

Obviously having more vCPU's (virtual CPU's) and more RAM by them self won't be able to alone help stop and/or prevent a DDoS attack, but let's say after a DDoS attack is finished and/or slowing down ...
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How much RAM is suggested for 150TB archive server [duplicate]

I'm building a server that will be required to store about 150TB of data that will periodically be dumped and retrieved, but not in a constant availability way like a NAS - we'll probably turn it off ...
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1answer
74 views

AWS High Memory Usage. How to detect the cause?

I'm using Amazon EC2 instance t2.small. And the memory usage is always increasing up to > 90% usage. Memory usage > 90 % $ free -m total used free shared buffers ...
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1answer
274 views

ProLiant Gen8 Microsoft BIOS records 8GB put POST only shows 4GB

I've got a HP Proliant Micro Gen 8 server. I've had it a while with 1 4GB RAM stick installed. I've now installed another 4GB RAM stick, its the same type, except its not an HP genuine stick (...
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Do memories from different manufacturers impact performance? Is there a way to measure it?

Memory in one of my systems: % lshw -C memory|grep vendor | grep -v NO | grep -v 'American Megatrends' | grep -v 'Intel' vendor: Samsung vendor: Samsung vendor: Micron ...
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2answers
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Out of memory at 18% usage : where the ram goes?

This is related to : Out of memory at 72% usage It looks to be the same problem but the question is slightly different : Where my memory goes ? I have 18% memory usage and my OOM Killer is killing ...
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3answers
755 views

MySQL memory usage is too high

I'm running Ubuntu 16.04 on a system with 64Gb RAM + 64Gb of swap partition. It's not a dedicated server so there're other processes running at the same time. Anyway when MySQL daemon is stopped, the ...
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0answers
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ExFat flash disk pen drive works well on my Mac, but I/O on Linux

I formatted a usb flash pen with ExFat file system. I did it on my Mac computer and on it it worked flawlessly. However, on my Linux it doesn't: the files can't be read or created, even though I can ...
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98 views

Should SQL Server min and max memory settings be fixed to the same value

Hello, If the server has the resources to dedicate to the SQL server should you keep the min and max server memory settings fixed at the same value? Will setting the values the same produce any ...
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HP z600 ram problems

Our HP z600 came with 2gb 2RX8 PC3-10600r ECC (1333mhz) installed, which works fine. Since 2gb obviously isn't enough, I bought 6x 2RX4 8gb PC3-10600r ECC (1333mhz). All sticks are exactly the same. ...
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1answer
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Install RAM in the server HP ProLiant DL180 G6

I have server HP ProLiant DL180 G6 with Windows Server 2008 x64. It has 64 GB of RAM installed. Only 32 are used. Changed the location of the RAM for this information https://support.hpe.com/hpsc/doc/...
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1answer
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How can I predict whether or not memory will bottleneck a CPU

My question is general, though I have a specific example. My question is this: How can I predict whether a powerful CPU will be fully exploited in a scenario with memory that is (relatively) low? My ...
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1answer
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HP MicroServer Gen 8 RAM

So my MicroServer currently have 1x4gb RAM installed in it. I would like to get this upgraded to the maximum supported, 16GB. DDR3 ECC 2x8gb is rather expensive. Would the server be happy with non ...
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1answer
394 views

KVM-QEMU Windows Guest Memory Speed

How to speed up memory in Windows guest running on KVM-QEMU hypervisor? The memory speed differs between Ubuntu guest and Windows 2016 Server on the same node quite a lot. Same benchmark tool counts ...
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1answer
54 views

Linux - memory size

How to check exact amount of memory installed in server? MemTotal from /proc/meminfo show something a bit less. I.e. I have 2097152K and meminfo says 2054348K. I can sum all banks reported by ...
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1answer
36 views

Hardware Checks after Air Conditioning Failure

We had an overnight air conditioning failure. We discovered that the temperature in the server room had reached about 110-115°F (43-46°C). We powered off everything that hadn't already and had the A/C ...
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1answer
41 views

Does it make sense to monitor free memory and CPU usage on servers?

I am monitoring my servers infrastructure using Icinga2 with some master/satellite configurations. On Linux and Windows hosts I am monitoring the defaults system metrics like CPU usage and free ...
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how much RAM do I need for memcached mod_pagespeed cache with 500k+ images?

I'm considering to move mod_pagespeed cache to an external memcached server. My website has around 500k images (125gb+ of data). These images are not static files, the images are dynamically generated ...
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does power supply redundant failure cause kernel panic?

Just after one of the power supply failed, the following error was recoreded in syslog. (the OS is ubuntu 14.04.) I am running a JVM (java virtual machine) with 64 HEAP on server with 128 RAM. do ...
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Bad performance on better hardware

I have postgresql streaming replication on 2 hosts and I've faced with the problem of different performance compared between two servers. It looks like all sql queries on one host are slower on 70-90% ...
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1answer
44 views

Proper way for memory testing on a server

I am a self taught system administrator at a little company. Our DC (which is a windows server 2012 r2 virtual machine running on a ESXi 6.0 host) recently started to crash with a BSOD at random in ...
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51 views

How can `cat /proc/$pid/cmdline` take several seconds?

I encountered this strange behavior yesterday on one of our servers. ps, pgrep and htop (on startup) were very slow. strace ps showed that read('/proc/$pid/cmdline) took several seconds on some ...
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2answers
304 views

Linux OOM-killer acting despite plenty available memory

Once a week or so the OOM-killer shoots down a postgres process in my server, despite that 'free' states it has plenty of available memory. I have read several threads here and there, but cant see ...
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se7520bd2 Wont post with more then 8gb of ram

Iv purchased 14 sticks of Samsung 2GB 2Rx4 PC2-3200R DDR2-400 ECC Server Memory Each stick reads: 2gb 2rx4 pc2-3200R-333-10-j1 Iv test with 2 sticks: posts. 4 Sticks: Posts. 6 Sticks: Fails. 8 ...
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Can I create a disk in memory for backups?

The biggest problem I have with my site is the 4 backup periods throughout the day where load will inevitably go above 50. I am using nice and ionice to try and reduce the impact but to only limited ...
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1answer
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What would cause memory errors

We had three boxes in the span of 3 days that went down due to memory errors, two of which went down within 2 hours of each other. All the boxes showed errors like: ECC single bit correction warning ...
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Does Apache httpd support special large pages/huge pages of memory?

Various applications support special large pages/huge pages of memory under various operating systems like Linux and Windows, e.g. Oracle with its SGA, Java using XX:+UseLargePages etc. I didn't find ...
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1answer
19 views

Which channel configuration is supported

I have a Dell 720xd server and a lot of these DIMMs on the shelf and would like to insert as many as possible into the server: sk hynix 8GB 1Rx4 PC3L-12800R-11-12-C2 HMT41GR7AFR4A-PB T8 AH 1347C ...
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1answer
47 views

Can a standard PCIe card fit on top of VLP (Very Low Profile) memory?

I am dealing with a motherboard https://b2b.gigabyte.com/Server-Motherboard/MZ31-AR0-rev-1x#ov where multiple memory slots are situated right in front of several PCIe slots and hence a full-length ...
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0answers
69 views

Knowage - out of memory

I've a knowage installation, my dataset has about 96k rows. When I try to draw a a table I get this error: I dug into log and many rows like this: SEVERE: The web application [/knowageqbeengine] ...
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1answer
274 views

Running memtest.exe from Windows 10 bootble USB

I used a microsft tool to create a bootable Window 10 install USB. The key contains memtest at: "H:\boot\memtest.exe" When I boot off the USB it goes into Windows 10 install - how can I run the ...
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Random shutdown, then doesn't power-on until power-plug is pulled out from wall and plugged back in [closed]

We have a workstation machine which, for the past three days, shuts down (apparently) randomly. After it shuts down, if you press the power button, the machine won't start. However, if you pull out ...
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1answer
119 views

Not able to change tomcat memory on AWS Ubunutu 16

Ok so this is a very odd behaviour. Setting jvm parameters -Xms6g -Xmx6g has no affect on tomcat. Tomcat doesn't allocate memory when checked with free -m or with top. I'm using Ubuntu Server 16.04 ...
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2answers
2k views

Can mixing RAM memory size (on its own) reduce dual channel performance?

I am considering purchasing a new laptop, specifically the Lenovo ThinkPad t580, which offers multiple memory configurations up to dual channel. Two of the many memory options (on the UK website) are: ...
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0answers
44 views

Tomcat Liferay https stops working after somedays. when restart server https starts working

I have a Liferay Server with SSL Installed. When i start server i can access it through https but after somedays(normally 4-5 days) https stops working and i have to restart server. If i do netstat -...
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0answers
40 views

Google Cloud Platform - Cannot extend memory of instance

I have a GCP instance which is currently a 16vCPU high-mem (104GB), and I would like to extend the memory. I am using 2 GPUs and unfortunately there is a limit on using GPUs with instances larger ...
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0answers
87 views

Limit postgreSQL maximum server memory

Is there any way to setup an upper boundary of memory usage for a postgresql database? Basically, a setting applicable to all processes started by postgresql. Basically, something similar to SQL's ...