All Questions
Tagged with performance memory
107
questions
-2
votes
1
answer
71
views
What are the consequences of RAM speed to high on a Proliant DL385 G7?
Rendering the 3D model of an optical lens or mirror with openSCAD can require huge amount of RAM, and for this use, I have maxed the RAM on a Proliant DL385 G7 but the RAMs I got were PC-14900: ...
- 97
1
vote
0
answers
1k
views
Performance of different DIMM modules setups
I am trying to achieve fastest possible DDR3 DIMM modules setup. I have researched available benchmarks, I was able to came to (reasonably satisfactory) resolution between these pairs
1DPC UDIMM vs ...
- 11
2
votes
1
answer
685
views
DELL PowerEdge R740xd - NUMA - memory performance
I have two physical database servers (both Windows Server 2016):
test server (5 years old):
DELL PowerEdge R730xd, 1x Intel(R) Xeon(R) CPU E5-2637 v4 @ 3.50GHz (4C/8T), 192 GB RAM (12x 16GB PC4-...
- 143
3
votes
2
answers
4k
views
php-fpm: why do I have a process memory usage higher than memory_limit
I know that there are a lot of related subjects, but I did not found my answer.
I have a dedicated server with 32Go of RAM (but I want php-fpm to use only 12Go max), and I have a php-fpm (7.2.13) ...
- 31
0
votes
1
answer
2k
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 ...
- 1
2
votes
0
answers
224
views
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% ...
- 243
14
votes
2
answers
70k
views
Can mixing RAM memory size (on its own) reduce dual channel performance? [closed]
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:
...
- 143
0
votes
1
answer
771
views
Improving SQL speed - Can SSD and more RAM be effective?
I'm running a website on a VPS package on nomral Hard drive, and 3.25 GB RAM.
I created a test page and realized that by simply including an SQL command such as:
SELECT Name from table where Name IN ...
- 101
4
votes
1
answer
7k
views
Optimal ARC and L2ARC settings for purpose specific storage application
I am configuring a server that runs 3 ZFS pools, 2 of which are rather purpose specific and I feel like the default recommendations are simply not optimized for them. Networking is facilitated by dual ...
- 163
3
votes
1
answer
2k
views
Intel Xeon 6134 + One DIMM per channel or two DIMMs per channel for maximum memory bandwidth?
I'm unable to find this critical piece of information in spec sheets. Appreciate any insight.
We're purchasing servers for HPC work with intel Xeon Gold 6134 (Skylake) cpus
I want maximum memory ...
- 167
4
votes
3
answers
13k
views
using correct number of DIMMS for best memory performance Intel Xeon scalable cpu
I am trying to understand what I guess is called a balanced memory configuration. For the newest cpu's from Intel at this point in time, January 2018 which are for example Xeon 8180 and Xeon 6154, ...
- 825
0
votes
1
answer
521
views
Server performance affected by MySQL memory consuption and CPU usage
Everyday during the peak time my server getting slow or down. Our hosting provider insisting us to upgrade the server but I think some performance tuning issue is there.
Adding the process ...
- 1
3
votes
1
answer
5k
views
Performance Monitor: Memory\Page Faults/sec vs Process\Page Faults/sec
When I was investigating some Hard Page Faults I came across this. Objects Memory & Process give different value's from the same counter: Page Faults/Sec. Are there some OS related processes that ...
- 133
-1
votes
1
answer
975
views
Linux - Use disk as RAM [closed]
I have a VM and in it a process that consumes a lot of memory (~200GB). Some sort of in-memory DB. I need to run it on a standard laptop and I cannot recompile it or see the code.
I've added 256GB of ...
- 139
40
votes
5
answers
10k
views
Should I be concerned that swap is being used on a host with nearly 40GB of free memory?
I have a production host, below:
The system is using 1GB of swap, while maintaining nearly 40GB of free, unused memory space. Should I be concerned about this, or is it mostly normal?
- 875
1
vote
1
answer
314
views
How conservative should I be when considering current cache use on a system?
Periodically, as with any large online service, we evaluate the current load on our hardware, and make attempts at "right-sizing" so that we're not paying for severely underutilized hardware.
How ...
- 875
11
votes
1
answer
1k
views
Can an IIS server have too much memory?
I've seem some claims that Exchange (link) and Elasticsearch (link) can suffer from "too much" memory. I also read a vague hint in an old book that the same might be true of IIS:
[T]he more [RAM] ...
- 404
6
votes
2
answers
4k
views
Does it involve network to copy a file within a NFS share? [closed]
I am assuming the following ways to copy a file with in a NFS share:
Process 1:
The client requests for the data to be copied from NFS share (if cache is not there) and the chunks of data are ...
- 691
2
votes
1
answer
762
views
Calculation of Xeon server memory bandwidth
I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz
The configuration looks like this.
4 memory channels per socket
DIMMs are 8x32 GB DDR4 2133/1866 modules ...
- 21
2
votes
2
answers
196
views
Is NUMA always completely NUMA or are there also hybrid systems?
I am working on a high-end server application where performance is critical. Given that servers are often employ NUMA-architectures, the server application also uses NUMA-aware memory allocation ...
- 217
8
votes
3
answers
9k
views
How to load balance with respect to memory, disk usage, and other attributes
I've found load balancers such as NGINX but those seem to work only by keeping in mind CPU usage and network traffic. How would I load balance with respect to other variables such as the amount of ...
- 199
0
votes
1
answer
305
views
Increase openfire memory to larger values
We use OpenFire for XMPP messages. We have some memory issues(OutOfMemoryError), and therefor we would like to increase memory. I know how to increase memory using VM options and we were able to ...
- 103
0
votes
0
answers
565
views
Real memory usage on Linux and Private_Dirty
On Linux, is using Private_Dirty value from smaps a good way to measure real process memory usage?
Thanks
0
votes
0
answers
473
views
Comparing 1x Xeon multi core vs 4x UltraSparc IV
I'm in the process of reviewing specs for hardware running an Oracle server.
The new hardware will be running using Xeon processor compared to the old servers (Solaris) running on UltraSparc IV.
So ...
- 151
0
votes
1
answer
6k
views
Will adding CPU cores or RAM to my cloud server improve speed in my situation? [duplicate]
I have a Siteground cloud server, and I know nothing about servers. It hosts 8 websites, although 3 of them have their own dedicated IP addresses and cPanels.
It's on a Linux server, but there's ...
- 163
5
votes
3
answers
3k
views
Generating a lot of dirty pages is blocking synchronous writes
We have processes doing background writes of big files. We would like those to have minimal impact on other processes.
Here is a test realised on SLES11 SP4. The server has massive memory, which ...
- 93
2
votes
1
answer
198
views
Side-effects of having different Memory (RAM) in a server? Example 1600 Mhz and 2100 Mhz [closed]
I know that you should always have the same memory clock speed and in best case even the same manufacturer meaning the same RAM Module.
But what happens if you use for example the following setup:
...
- 1,451
0
votes
1
answer
64
views
Which memory settings to use for this MySQL server? [duplicate]
I've been looking in a lot of places so far but I couldn't find any articles about how much memory to allocate to MySQL based on server size.
I am about to deploy a website on a relatively small ...
1
vote
1
answer
172
views
HDD seq. read performance
I read the specs for one of the latest Hitachi HDD, https://www.hgst.com/sites/default/files/resources/USC10K1800_ds.pdf . It indicates a speed of
SAS 12 Gb/s
which is 1.5 GB/s. Is it the sequential ...
- 129
0
votes
0
answers
203
views
The difference in performance of different memory mount in dell poweredge R430
There are 3 servers R430 (S1, S2, S3). All of them have 2 procesors and 8*8GB of ram in slots A1-A4 and B1-B4.
There is a need of extending memory.
I've read dell recomendations (http://www.dell.com/...
- 1,046
0
votes
1
answer
272
views
Is it bad to use swap with SSD when running a server out of memory?
I have DigitalOcean VPS, which has 2GB of memory.
I'm soon running or am about to run out of it.
How big is the performance hit if I use big swap? DO use SSD has harddrives, and I'm not the one who ...
- 163
1
vote
2
answers
1k
views
Can one root server handle over 50M requests per month? [duplicate]
I am running a LAMP Application installed on one server, happily serving about 1M PI per month. Now I am looking into a potential partnership where my app might serve around 50-80M requests per month. ...
- 2,113
0
votes
0
answers
1k
views
vSphere | VMs are balooning and swapping | sched.mem.max paratmetar does not exist
I have two VMs in ESXi5.5 environment that are swapping memory. After a long research I found out the below two articles where it is explained that one must compare the values of memsize and sched.mem....
- 1,154
0
votes
3
answers
2k
views
I/O and RAM limitations are important for Hadoop performance. But is disk speed related to I/O?
Hortonworks says this: "Most often performance of a Hadoop cluster will not be constrained by disk speed – I/O and RAM limitations will be more important." *
How is disk speed not related to I/O ...
- 158
1
vote
0
answers
67
views
Why is my server using swap even though there is lots of RAM available? [duplicate]
My server has 24 cores, 16 GB RAM, and 8 SSDs on raid 0 (I think).
I've noticed it is now using a low of swap space, even though there is plenty of RAM available.
load average: 2.70, 2.54, 2.50
Mem: ...
- 231
2
votes
2
answers
3k
views
Lots of major page faults in CentOS
We have a fairly complicated PHP script that's generating a lot of minor and major page faults.
$> ps -o min_flt,maj_flt,time,cmd,pid 4686
MINFL MAJFL TIME CMD ...
- 123
5
votes
3
answers
7k
views
Mysql crashing, oom-killer, out of memory, tuning issues?
I just moved all of my websites to a new server with 4GB RAM. Almost immediately, mysql started crashing, and at one point, didn't reboot which caused a major outage (since I didn't notice until ...
- 287
1
vote
1
answer
1k
views
can Iowait cause significant RAM consumption increase
I have a node.js process running continuously on a linux EC2 instance, it extracts data and stores it in mysql. Some reads are also performed on the database.
The process can run well during hours or ...
- 121
0
votes
1
answer
126
views
Trading Engine running on RHEL 5.x [closed]
Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work.
In our company ...
- 206
4
votes
3
answers
558
views
Can more memory than I need slow down my server?
We're about to install a memory intensive application and will purchase a server for it. The server will have at least 4 CPUs, with multiple cores. While the application is memory intensive, the ...
- 141
1
vote
3
answers
4k
views
slow website load and high memory usage
my site has been slowed down last couple of days ... some image doesn't show up ... i got
408 Request Time-out: Server timeout waiting for the HTTP request from the client
couple of times which ...
- 187
6
votes
2
answers
69k
views
Apache consuming too much CPU and memory
I'm having some troubles with CPU and memory usage with an Apache Web Server.
We're running an Ubuntu Server 12.04 LTS on a Virtual Machine. Our server has following specs:
8GB RAM;
4 vCPUs (12ghz);
...
- 265
2
votes
1
answer
4k
views
Should CPU usage be so low while memory usage is high on heavy mysql server?
I'm using ubuntu server 12.04 x64.
The server receives a lot of requests to mysql through apache web server (it's light interface). From mysql stats I see there is approx 250 queries / second from 8 ...
- 333
0
votes
1
answer
2k
views
-XX:MaxNewSize and other JVM parameter setting in AIX
All,
I am trying to adjust our application's memory settings: JVM and Heap adjustments. I also came across -XX:MaxNewSize parameter.
Our application runs on a AIX machine which has ample RAM (100+ GB)....
- 133
0
votes
1
answer
40
views
One Slower/Larger VS Two Faster/Smaller RAM [closed]
Generally speaking, performance-wise, which one is the best (putting brands aside)?
1x 8GB 1333MHz RAM
or
2x 4GB 2400MHz RAM
Both DDR3.
- 101
1
vote
0
answers
3k
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. ...
-2
votes
4
answers
2k
views
will a 100GB database with large tables on MSSQL 2008 server run on a 3GB RAM system? [duplicate]
This will be only for testing and developing.
I have a 100 GB DB I am working on and need a sanbox envorinment.
The only hardware I have is a desktop with 3GB and 32bit.
I am able to install SQL 2008 ...
-1
votes
1
answer
178
views
Choosing linux server for mysql - memory clock speed [duplicate]
I have a Linux Mysql server cluster where master and slaves are overloaded by a combination of read/write i/o and by SELECT queries load.
We purchased FusionIO cards to replace the hard drives. My ...
- 101
3
votes
2
answers
6k
views
About huge page and translation Lookaside Buffer
they confuse me.
huge page: the way to manage physical memory of OS kernel, it is split huge page by kernel for reduce the index number in page table.
I get it from :
https://stackoverflow.com/...
- 51
3
votes
2
answers
10k
views
Changing memory allocator to Jemalloc Centos 6
After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run ...
- 197