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

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2
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1answer
17 views

JVM on Windows - paging and full GCs

We have a Java-based app (TeamCity, on Tomcat, on Java 1.7) running on Windows (Server 2012 R2). Java runs with a 6GB max heap size, and the system has 10GB of RAM. It is the only non-OS service ...
12
votes
3answers
3k views

Balancing RAM when using multiple CPUs

We have HP DL360 G7 server with one cpu and 16G 12G ram. We plan to add another cpu. So, we need also ram for second cpu. Is there any negative performance impact if we add different size of ram to ...
17
votes
6answers
34k views

How to find memory usage of individual Windows services?

Task Manager shows the overall memory usage of svchost.exe. Is there a way to view the memory usage of individual services? Note this is similar to ...
38
votes
4answers
22k views

In Linux, what is the difference between “buffers” and “cache” reported by the free command?

This is an old question that I've seen from time to time. My understanding of it is rather limited (having read about the differences a long time ago, but the factoid(s) involved never really stuck). ...
6
votes
6answers
1k views

Can a server have “too much” RAM? Is there an optimal level of RAM, or is more always better?

Recently, I had our server admin tell me that the new servers we'd ordered with 140GB of RAM on them had "too much" ram and that servers started to suffer with more than about 80GB, since that was ...
0
votes
0answers
24 views

IO Rate is exceedingly incrementing

I have read through Is a 'high' IO rate healthy?, and was at ease when I read someone say that even 50,000 / hr wasn't an issue.... or not unhealthy, to answer their question; so I increased ...
3
votes
3answers
68 views

Detect memory ballooning from within the affected VM

Is it possible to detect from within a Linux VM that memory is being reclaimed by the memory balloon? I don't think any information about the host is propagated to the VM, so connecting to the host ...
21
votes
4answers
19k views

What is ECC ram and why is it better?

I've seen a dicussion about ECC ram use on servers. Why is it better?
1
vote
1answer
167 views

Mixing RAM brands

I'm scheduled to install a server at a colo facility tomorrow, but I've hit a snag. ESXi doesn't like the fact that I have 12GB ram in my server (8 GB on one side of the CPU, 4 GB on the ...
2
votes
1answer
28 views

Different server response time for 2 web pages with the same view and template?

I've recently been facing hugely increased server response time for some of my web pages (response time in the range of 10-20 seconds). For example, for the page http://www.edmhunters.com/afrojack/ - ...
1
vote
1answer
935 views

Maximum amount of memory per session with IIS/.NET

I'm troubleshooting some memory issues we're running into with a heavily used ASP.NET site hosted on IIS6. Intermittently we have to manually recycle our application pool (process) to resolve issues ...
0
votes
1answer
25 views

Allow Apache use more memory

I use apache2 behind nginx on 8 core CPU 48GB RAM server. Now my system uses only 3GB of all memory, but there are high load on CPUs. How can I use my free memory instead of CPUs time? I also use ...
52
votes
11answers
9k views

Why drop caches in Linux?

In our servers we have a habit of dropping caches at midnight. sync; echo 3 > /proc/sys/vm/drop_caches When I run the code it seems to free up lots of RAM, but do I really need to do that. ...
0
votes
1answer
11 views

ML350 G5 Intel Xeon 5130 Server Dual Core and memory module of 4GB

I want to buy ML350 G5 Intel Xeon 5130 Server Dual Core 2GHz which have 2GB ECC RAM. I am .net developer and I want to setup server as my dev. server in my house. On official page there is Maximum ...
0
votes
3answers
1k views

APT FATAL -> Failed to fork

I saw a lot of questions regarding this, but mine seems a little different. Here's what I receive: /etc/cron.weekly/apt-xapian-index: FATAL -> Failed to fork. run-parts: ...
2
votes
0answers
52 views

Where is my RAM going? [duplicate]

I see only 370 MB (10%) free on an AWS Amazon Linux instance: $ free -m total used free shared buffers cached Mem: 3752 3709 42 0 ...
1
vote
2answers
889 views

troubleshooting out of memory error messages from mysql

we have a web application (racktables) that's giving us grief on our production box. whenever users try to run a search, it gives the following error: Pdo exception: PDOException SQLSTATE[HY000]: ...
0
votes
2answers
4k views

Multibit error encountered on Dell Server Memory

Dell OpenManage reported the following: Memory device status is critical Memory device location: DIMM_B2 Possible memory module event cause:Multi bit error encountered What does this mean? How bad ...
1
vote
1answer
44 views

Coldfusion JVM heap vs RAM usage

I need help clarifying memory usage on a CentOS server running Coldfusion/Apache. I've got a script that reads a file into memory and process it line by line, inserts into DB and deletes the file. ...
0
votes
3answers
82 views

Why wouldn't I want to enable swap?

I recently had an issue where a rogue process caused some ec2 instances to run out of memory and crash. It probably shouldn't have been an issue, except I was using t2.small instances which are pretty ...
16
votes
2answers
3k views

Where did my RAM go?

Note: before you jump in too fast, yes I read linuxatemyram.com! I have a server with 64GB RAM. free -m says that my RAM is full, and it's not because of disk caching: total used ...
1
vote
1answer
930 views

What does `numactl --localalloc` do?

What does numactl --localalloc do? Does it bind program allocation to only the single node that numactl --localalloc was run on? Or does it ensure that whenever the program allocates it's given memory ...
1
vote
0answers
26 views

make linux kernel read swap back into memory [closed]

Occasionally, I run a script that uses the majority of the 16GB of physical memory on my workstation. The kernel then swaps out the rest to swap partitions on multiple disks. After the script is ...
19
votes
5answers
3k views

Unusually high dentry cache usage

Problem A CentOS machine with kernel 2.6.32 and 128 GB physical RAM ran into trouble a few days ago. The responsible system administrator tells me that the PHP-FPM application was not responding to ...
-2
votes
1answer
47 views

Clearing Memory (RAM) Cache on CentOS

I know this has been asked in a similar way in the past but I'm just curious. If I made a script and made it run every midnight to check if my memory usage was higher than let's say, 80... would it ...
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vote
2answers
3k views

ECC RAM, Background Scrubbing, and IOMMU BIOS Settings

I'm upping the RAM in one of our servers from 2GB to 4GB. Looking around in the BIOS, I see the following settings: DRAM ECC Enable (Enabled) MCA DRAM ECC Logging (Disabled) ECC Chip Kill (Disable) ...
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votes
0answers
14 views

Why a quad-processor with enough free RAM and low CPU usage become very slow? [migrated]

In a computer with Intel Core i3 and 4GB of RAM running Windows 8.1 build 9600, in conditions I expect no have performance problems it become very very slow and it's close to freeze (or even freeze ...
0
votes
0answers
282 views

X7DWN+ 14GB Memory Fitted - 10GB Detected by BIOS

We have a Supermicro X7DWN+ motherboard with two Xeon L5420 CPU's installed. There is a total of 14GB memory installed, however the BIOS is only seeing 10GB. The memory has been tested in another ...
0
votes
1answer
114 views

Hyper-V: CentOS 6.6 guest with Dynamic Memory - Should I see memory decrease from guest OS?

I'm testing CentOS 6.6 in Hyper-V (W2K12R2) with dynamic memory. I set Startup and Minimum Memory to 4096MB, Maximum Memory to 16384MB. 20% buffer size. After boot I can see it's memory size as ...
0
votes
2answers
57 views

when is the jvm heap allocated by the OS

One of our sap systems(PI ABAP+JAVA stack) was giving performance issue. The entire 64GB configured for the machine gets hogged up(and the 8 cores as well). Every one is suspecting the java part,but i ...
0
votes
2answers
187 views

How to handle Docker memory management?

Update: Rather than spinning up my resque worker through the docker command (to test), I instead killed all my containers with fig kill, added it to the fig configuration, and ran fig up. This worked ...
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votes
3answers
81 views

free shows more memory used than top process total

UPDATE: This was being caused due to a known issue with nss-softkn. See this article: https://www.splyt.com/blog/2014-05-16-optimizing-aws-nss-softoken When I run free -m from my centos 6.5 box I ...
0
votes
1answer
46 views

PHP Script causing server to run out of RAM and wont release

Ive been running a very resource hungry script the past 2 days. I manually trigger the call and it lasts for about 30 minutes then stops. Last night the script stalled when ram hit 100%. I restarted ...
0
votes
1answer
74 views

How much RAM will Apache web server use if 10 users download a 100 MB file simultaneously? [closed]

I'm planning to buy a dedicated server from 1and1.com. There are many configurations on their site. Which one should I go for if I run the LAMP stack on CentOS and host files which users can download? ...
0
votes
0answers
29 views

Difference between ps_mem.py & free -m . Ubuntu server kills processes

Previously, I had a 4GB RAM server with Linode. Several times, I did "free -m" command to check available memory. I asked question here as well, but realized its more appropriate here. Most of the ...
2
votes
2answers
549 views

What does monit consider to be memory usage?

Once can have monit monitor memory usage… check system foo if memory usage > 95% then alert Does it use free RAM, or free -/+ buffers/cache? (or something else?) # free -m total ...
0
votes
1answer
25 views

Memory errors despite plenty of headroom (Ubuntu VPS)

I'm getting all sorts of memory-related errors from python and php, plus segmentation faults - yet the output of free -m constantly shows plenty of spare memory - i.e. greg@greg-brown:~$ free -m ...
-3
votes
2answers
36 views

Should I upgrade to more memory? [duplicate]

I'm using WHM on a VPS and am trying to work out whether or not I need to upgrade the hardware. I've currently got 4GB of memory. When I look at the daily process log it seems I have a site averaging ...
1
vote
1answer
34 views

Swap 99% but regular memory fine

I have a 1GB VPS server. I setup 1GB of swap ram too a few weeks ago and quite often it's hitting 99% whilst the regular memory is usually 40% - 60%. Most of my sites on the server run fine and fast. ...
0
votes
3answers
116 views

Selecting a webserver configuration

I have a website, which has grown from 10 visits per day, to 100 per day in couple of months, and now to about 800 unique visits per day. So far, I have been using a VPS with 512MB RAM, and shared ...
0
votes
1answer
141 views

How can used physical memory exceed sum of 'resident' memory reported by processes?

Given the output of top shown below (which shows all processes currently active): how is it possible that this virtual server reports ~500M physical memory as used (used - cached, verified by free), ...
0
votes
0answers
69 views

How to limit the RAM used by Apache Tomcat on AWS micro instance?

I am running Apache Tomcat with Geoserver as a .WAR on an AWS micro server running Ubuntu 14.04 with 1 GB RAM and ~700 MB swap, and I am concerned about my RAM usage because it is overflowing into my ...
6
votes
1answer
82 views

How can I find which memory have CE error?

In /var/log/kern.log: kernel: [13291329.657499] EDAC MC0: 48 CE error on CPU#0Channel#2_DIMM#0 (channel:2 slot:0 page:0x0 offset:0x0 grain:8 syndrome:0x0) This is edac log, one of the memory have ...
0
votes
1answer
34 views

Dell Poweredge 2970 - Cheap subsitute/compatible RAM for lab env? [closed]

I'm building a lab environment for virtualized routers, in prep for my next network cert. I have a Dell Poweredge 2970, but it only has 16G of RAM. I need to upgrade the RAM, to the max of 64GB, but ...
6
votes
5answers
4k views

How does a 32-bit machine support more than 4 GB of RAM?

I have always wondered about this and never totally understood how 32 bit machines are addressing more than 4 GB of RAM. I mean, there are no more address lines left, correct? I know even in our ...
1
vote
1answer
65 views

ps_mem.py vs top - memory usage?

Every now and again my apache server is crashing, getting an error saying the MaxClients has been reached. In my research I've gained the impression that I may be running out of memory (just checked ...
2
votes
3answers
70 views

java program out of memory before reaching xmx

On a Redhat CentOS 6.4 are only a few process running, using about 3GB RAM (System has 12GB available). One of the processes is a WSO2ESB Server (java), we start it with those parameters: -Xms2048m ...
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votes
1answer
72 views

How to release the physical and virtual memory used from the mysql server? [closed]

Several php scripts are executed from cron on my CentOS 6.5, every php script contain database requests. Depending on the php object size and type the database requests can allocate too much memory. ...
5
votes
7answers
804 views

Bad byte in one RAM module / Block area of RAM from being used

I have four 512 MB RAM modules in one server. The fourth RAM is showing error for only one bit when I use memtest86+ to test the RAMs. Even when I swap the RAM in fourth slot with some other RAM I ...
2
votes
2answers
710 views

HP Proliant DL360 G7 All DIMM indicator lights amber

I am currently doing a RAM upgrade on an HP proliant DL360 G7 server. After installing the new RAM (18x 8GB KTH-PL316E/8G) the LED indicator lights for every single DIMM turned amber and the health ...