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

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717 views

1GB VPS - Apache Worker MPM - FCGID - Max concurrent connections - RAM CAP

I have spent a week or two researching and setting up my server to run Apache with the Worker MPM and FCID. I am trying to optimize it to allow for the most concurrent connections possible. It has ...
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426 views

MySQL memory usage - Periodically need to run FLUSH TABLES or memory usage keeps growing with large-pages turned on

After switching our rather memory + physical core rich database server to large-pages, we have noticed a small issue. The memory usage almost looks like there is some sort of memory leak. But ...
3
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1answer
143 views

How does recent VMware ESXi (>= 5.1) use unallocated memory?

When an ESXi host is not under memory pressure (ie, running VMs are consuming less memory than physically available) how is "free" memory managed? Does it have some sort of block cache for block ...
2
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1answer
52 views

Where are the ECC memory error counters stored?

Where are the ECC memory error counters stored: on the DIMM itself, the motherboard, or the host's disk? I'm using memtest86+, but it seems that it doesn't recognize ECC on my system, so if ...
2
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1answer
2k views

Why am I missing 4GB of RAM on Windows Server 2008 R2 64bit?

I noticed today that a server was very low on memory. It physically has 8GB installed and runs Windows 2008 R2 Standard 64bit. It also hosts 2 virtual machines using HyperV. Server is Dell ...
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58 views

What is System Code Total Bytes

I am trying to use perfmon, and according to MSDN, the "System Code Total Bytes" counter ... Shows the size, in bytes, of pageable operating system code currently in virtual memory. It is a ...
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182 views

Linux buffer memory always stays at zero

One of my hosted server is a Xen guest running Debian and linux kernel 2.6.32 then 2.6.38. It has been running fine for quite some time (more than a year) but I recently noticed something weird. For ...
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434 views

Apache is not using SWAP and it's reporting page allocation failure

Check the logs: httpd: page allocation failure. order:4, mode:0xd0 Call Trace: [<ffffffff8000f696>] __alloc_pages+0x2ef/0x308 [<ffffffff80017a40>] cache_grow+0x139/0x3c7 ...
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65 views

Load balanced asp.net websites and required memory usage

Each of my servers has 8Gb RAM and the memory usage hovers around 7Gb. I have a load balancer available to me but at the moment I'm worried that putting my sites through it will cause the platform to ...
2
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311 views

Can I monitor a service's memory/cpu usage on OpenSolaris?

What would be the best way to monitor a service's memory/load on the OpenSolaris platform so that one can send alerts and automate service management (restarts, etc) based on "rules"? On the linux ...
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19 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 ...
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80 views

What happens to a random bit error in the cache on an Intel CPU?

I have a system with ECC RAM and a Xeon E3 CPU. My understanding is that ECC circuits on the RAM will detect corruption from random bit errors in the RAM chips. But what happens to random bit errors ...
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198 views

Redis server Memory Increased to 22GB and Crashed (OOM)

A redis server v2.8.4 is running on a Ubuntu 14.04 VPS with 8 GB RAM and 16 GB swap space (on SSDs). However htop shows that redis alone is taking up 22.4 G of memory! I do not think the redis ...
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1answer
50 views

Tracking memory problems

I'm experiencing some trouble with my Windows Server 2008. We're using it for hosting a bunch (~50) of Web GIS applications on IIS. This setup usually works very well, but when certain applications ...
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1answer
422 views

Mysql running out of memory

I am having a lot of trouble with mysql eating too much ram on a small machine and am looking for some help in figuring out why it is eating so much. I have a small virtual machine with 256MB of RAM ...
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1answer
126 views

Classic ASP apps on IIS shuts down when memory usage goes over 90%

I've got an issue where all classic ASP apps on IIS shut down, when the crowded server exceeds 90% memory usage. This is because ASP apps cannot create new sessions any longer. The ASP.NET apps are ...
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489 views

Mysql crashing due to InnoDB not able to allocate memory

MySQL crashes every now and then due to, I believe, a large request hitting it above the innodb-buffer-pool-size set in my.cnf (currently at 210M), which I needed to set for mysql to start in the ...
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659 views

Avoiding memory full -> swap full -> crash

I'm experiencing an issue when sometimes the memory gets 100% full, and the swap file also, and the server becomes non-responsive and has to be restarted (causing also problems in database). This is ...
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1answer
175 views

How to change memory for DomU runtime

I have a xen server with xen-4.1.3, linux-image-3.2.0-3-amd64, debian squeeze and 16Gb of RAM. The domain-0 has 1Gb of ram, the rest of memory belongs to the hypervisor. I want to start a guest domain ...
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225 views

Will this mixed size RAM configuration work? Xeon 56xx ECC

This image show valid/invalid configurations according to IBM: Will this configuration pictured here work as well? This diagram is mine: Exact configuration: CPU 1: 3x 16GB 1600MHz Dual Rank CPU ...
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1answer
530 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 ...
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1answer
872 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 ...
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1answer
136 views

Tune IIS 6 for high-cpu, high-RAM server

Are there any suggested tuning options for a web server running on a multi-core (16) server with 16GB RAM? It is an old DB server that was transitioned to a load balanced web server farm however with ...
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1answer
860 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 ...
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1answer
543 views

OpenVZ Swap space?

From what I understand with OpenVZ you just increase privvmpages and vmguarpages for the swap memory, and even though the guest shows it as RAM the host will swap it were possible. Am I right here or ...
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1answer
328 views

What kernel structure represents memory for tmpfs and cached/buffer reported by free/top/vmstat?

OK so here is a follow on question to link. When I create a tmpfs filesystem on t and allocate say 100MB of space, why can't I see it in slabtop or /proc/slabinfo. I thought maybe it was because it ...
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1answer
415 views

Which requests cause a w3wp process to grow considerably?

On a production environment, how can one discover which Asp.Net http requests, whether aspx or asmx or custom, are causing the most memory pressure within a w3wp.exe process? I don't mean memory leaks ...
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1answer
27 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 ...
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1answer
40 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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1answer
27 views

New Relic memory reporting

We're using New Relic to monitor a server and a PHP application. New Relic is reporting memory usage of 90%+, which aligns with top. However, the sum of memory used by the processes in New Relic ...
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1answer
28 views

Is it possible to force a specific program to use virtual memory?

Let say I have 1GB RAM Ubuntu, I need to run both memcached and redis on the same machine The usage of memcached is quite heavy (e.g. 1K read per second) and redis is less heavy (but still 10 read ...
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36 views

IBM memory, whats wrong, bought wrong type?

I have this server IBM System x3250 M3 Intel(R) Xeon(R) CPU X3450 @ 2.67GHz (8 CPUs), ~2.7GHz 2 GB PC3-10600 ECC DDR3 SDRAM HDD 500 TB Hotplug Windows server 2008 this is screenshot the default ...
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65 views

Apache2 using up all my memory and stalling my wordpress instance (mysql)

Environment Ubuntu 12.04 / 1GB RAM / 40GB DISK / 1 CPU (RACKSPACE) Wordpress 3.9 mysql Ver 14.14 Distrib 5.5.38, for debian-linux-gnu (x86_64) using readline 6.2 Apache2 mod_php5 mod_rewrite When ...
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1answer
71 views

Is memtester a good command line memory test?

I have spent awhile looking for a memory testing tool that works from the command line, and have been unable to find anything besides memtester (http://pyropus.ca/software/memtester/). Eventually ...
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55 views

How can we calculate a processes' contribution to “commit” (/proc/meminfo “Committed_AS”)

We are seeing a "leak" in "commit" over time, and need to track the offending process(es). RSS ("used" memory") isn't leaking, but the commit is, and its causing the kernel to behave very cruelly ...
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189 views

ECC CE (Correctable Error) occuring every 5 minutes exactly

On one of our computing nodes I am getting ECC CE (correctable errors). What is a little bit peculiar about is is that errors are not massive, just a single occurrence exactly every 5 minutes. ...
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396 views

how to set up shared memory and make it available?

I try to setup shared memory for Sybase ASE 12.5 on CentOS. My server has 17G memory, I want to make 14G (=17-1-2)available for sybase. (1G for os, 2G for ramdisk 14 = 17-1-2). here is the info: ...
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264 views

Disabling locked page allocations in SQL Server 2012

Locked page allocations are enabled in my instance of SQL server 2012 even though I have no accounts with the "lock pages in memory" user right. This article by Microsoft - ...
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894 views

MySQL (MariaDB) crashes frequently

I recently migrated an old server running MySQL to a new VPS running MariaDB 5.5. I don't have too much running on the server (just a few PHP sites) and free memory seems to be OK, but the DB keeps ...
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107 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), ...
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37 views

IBM SystemX 3400 M3 - 4GB DIMMS along with 8GB DIMMS

We have an IBM SystemX 3400M3 server with 4 X 4 GB Dimms and 1 CPU. We asked our hardware vendor for an upgrade - 2nd CPU , additional Harddisks , additional RAM. He delivered us IBM RAMs ( 3 x 8GB ...
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310 views

Apache 2.2 - how to reduce memory footprint

On my server with Ubuntu 12.04 LTS server i have Apache 2.2.22. Serverspecs: Quad-Core AMD Opteron(tm) Processor 1381, 4 cores 4 GB Ram 2x500 Harddisk in Raid 1 I have magento 1.7 running on ...
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448 views

How to avoid Memory “Hard Fault/sec”

i've a problem on my windows 2008 server x64, and i cannot understand how can i solve it. i'm looking to Resource Monitor and see about 100 to 200 hard faults/sec. and generally the machine is slow. ...
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301 views

CentOS 6.4 on Hyper-V memory exhausting issue

I am having an issue where the RAM on the virtualised machine is becoming exhausted after periods of time, the machine itself has 4GB RAM assigned to it and it always seems to be reporting around 15% ...
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81 views

How do I test the integrity of a mini-DIMM memory module?

I have one Mini-DIMM memory-module which I would like to test using MemTest86+. While I'm aware that some RAID controllers and network equipment use DDR2/DDR3 memory packaged on mini-DIMM form-factor ...
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54 views

how do dual processors handle 4 dimms

I'm looking at using dual Xeon E5-2620s on a server build. They support quad channel memory. If I have 4 dimms, will the two processors see it collectively as quad rank, or each processor see a dual ...
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104 views

Postgres using only 500 MB of RAM of the available 4 GB

We recently moved to running postgres server on it's own VM and tracked the memory usage of the VM. Here is what I found: That the postgres is only using 500 MB of the available memory on the VM. ...
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107 views

Solaris memory allocation

I have solaris system that installed 12 GB RAM. All running process consume about %65 memory. I start to application that tshark (wireshark command line alternative). Tshark complete parse a ...
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260 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 ...
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155 views

Run a secondary PostgreSQL server in memory?

Our development server currently has a file-based PostgreSQL server installed and running perfectly. However, we're trying to speed up our Rspec/Autotest runs and I was thinking that running a ...