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50 views

howto interpret `cryptsetup benchmark` results?

summary: I can run cryptsetup benchmark and sort the results, but seek guidance in their interpretation. E.g., should I give more weight to encryption speed or decryption speed? Should key-derivation ...
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0answers
8 views

What are useful options for testing a usb drive with fio?

I would test some usb drives using fio. I started with the tutorial on linux.com, but it was mainly for hard disk drives. This is the test I use for my hard drives: [random-read] rw=randread ...
3
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1answer
34 views

Benchmarking With SELinux

I've been performing some benchmarking tasks on freshly installed CentOS machines with SELinux enabled and disabled. The tasks include copying files of various sizes, sending variable amounts of data ...
1
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0answers
17 views

How can I benchmark or audit an embedded kernel?

Is there a reliable or industry standard way to benchmark or audit embedded kernel performance? The target of the audit is to determine the time that the kernel spends in certain critical section, ...
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0answers
39 views

HPL benchmark show very low calculation speed

I’m constructing cluster for mph parallel calculation. To check performance of my node, I used HPL linpack benchmark. However, the benchmark result is much more low than a theoretical value. The ...
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0answers
23 views

IO benchmark tools block size impact?

Many IO benchmark tools (fio, dd, etc...) provide way to set block size. Lets say that I change 4K to 64k and test read/write on mounted SATA disk. I will get higher data throughput in sequential ...
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0answers
12 views

Where to find information about tests from Phoronix test suite?

Phoronix Test Suite is a linux benchmarking tool made of tests and suites of tests. To print all available test phoronix-test-suite list-available-tests To print all available suites ...
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0answers
20 views

GNOME Disks Sample Size

I'm trying to use GNOME Disks to test my disk performance and, according to my previous experience, I'd like to set the sample size to 8K, 16K and 32K. However, I see the minimal sample size in its ...
2
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0answers
11 views

How to force a dependency conflict for benchmarks?

I want to measure the time portage needs for solving dependency conflicts on a gentoo system. For a benchmark I need a reproducible conflict situation. It should have many solvable conflicts. ...
0
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1answer
91 views

How can I benchmark NFS and SMB transfer speeds?

I'd like to compare the speeds of NFS and SMB across my network. Is there any good (and simple) tool to let me do this? Ideally I'd like something I can just point at my mounted filesystem (i.e. ...
1
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0answers
46 views

How can I profile/benchmark RAM performance?

I would like to know if my memory hardware is a bottleneck of my system performance. I am dealing with really old hardware (late 2000). If there is room for improvement, I would like to upgrade. ...
3
votes
2answers
168 views

Telling Linux kernel *not* to use certain CPUs

I'm trying to run some benchmarks on a multicore machine and I'd like to tell the Linux kernel to simply avoid certain cores unless explicitly told to use them. The idea is that I could set aside a ...
4
votes
2answers
166 views

What is actually the speed reported by dd?

I always thought that when doing: dd if=/dev/sdx of=/dev/sdy the report which is displayed once the command finishes, such as: 79304319+0 records in 79304319+0 records out 40603811328 bytes (41 ...
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2answers
373 views

How to benchmark memory in an embedded linux device?

Is there a generic utility to benchmark external memory device (eMMC, DDR) throughput on an embedded device (e.g. raspberry pi)? memtester, bonnie, bonnie++, memtest, dd? I've been running into ...
3
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0answers
110 views

How to generate graphs from lmbench results?

I need to use the lmbench benchmarking tool to get the system performance statistics. I am able to execute and run the results. In the results folder this is a MakeFile with this information # ...
0
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0answers
130 views

Interpreting bonnie++ sequential throughtput results: is my unterstanding right?

I have started since years to accumulate bonnie++ stats from different systems. Here is a shot from a rather fask disk: django ssd Samsung SSD 840 EVO 1TB with hdparm write cache enabled: Version ...
0
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3answers
111 views

Which commands or operations can be used to put the cpu under intense load?

I would like to measure latencies during high cpu usage but I don't have benchmarking tools like stress and I can't install them. Which operations do you recommend to put the cpu under intense load? ...
1
vote
1answer
285 views

Simple floating point benchmark that can be compiled from source?

I am interested in benchmarking some ARM platforms; can anyone suggest a simple benchmark with source code that can be used to benchmark floating point performance? A package such as a .deb file ...
5
votes
3answers
379 views

How to measure Firefox's startup time?

I would like to measure how much time it takes for some softwares to start. I know the command time but in the case of firefox (iceweasel for me on Debian), this command prints only the time I let ...
1
vote
1answer
115 views

question about installing Rally on OpenStack

I have a quick question that I'm going to install Rally to benchmark OpenStack and I've read it's documents here. Now, I don't know if I install Rally on a vm in OpenStack that there's no service on ...
1
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1answer
148 views

Can I use fio on a mounted device?

I'm using fio to get some broad read IOPS performance data for various storage configurations like this: fio --name=readiops --filename=/dev/md1 --direct=1 --rw=randread --bs=4k --numjobs=4 ...
3
votes
1answer
72 views

Using SLURM without a feature

Suppose my super computer has the following NODELIST's with the included features: NODELIST FEATURES NodeA (none) NodeB specialfeature and I am trying to benchmark ...
18
votes
3answers
2k views

Why is coreutils sort slower than Python?

I wrote the following script to test the speed of Python's sort functionality: from sys import stdin, stdout lines = list(stdin) lines.sort() stdout.writelines(lines) I then compared this to the ...
1
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0answers
53 views

How fast is a process reading/writting virtual memory?

So, we have top, htop, iotop, iostat, vmstat, etc, to measure many different things on Linux, but how can one measure how much MB/s a process is reading and writting to/from RAM, i.e., virtual memory? ...
1
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0answers
35 views

How can we measure performance overhead resulting from writing to files or folders?

I have a tool which takes as input a folder or a file and then it logs operations done on that file or folder (modifying,deletion,creating new folders or files, etc). I was looking for a way to ...
0
votes
1answer
428 views

iozone runs fail with “No such file or directory” errors

I want to start using iozone to benchmark an aufs filesystem on a virtual machine on ubuntu. I tried following the manual to use relevant parameters, but I keep getting a weird error on most runs. I ...
1
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1answer
204 views

Measuring transfer speed of USB drive

I want to write a program to find out the average data transfer speed of my USB port. How do I go about implementing it? The only method I can think of is writing a large file to the path where the ...
8
votes
2answers
2k views

Simulate an unkillable process in D state

For catastrophe testing scenarios on out server environment we're looking for an easy way to make a process stuck in D (uninterruptible sleep) state. Any easy ways? An example C sample code would be ...
3
votes
2answers
763 views

Read all files in folder and subfolders - progress and size

Command I have is: time find . -type f -print -exec cp {} /dev/null \; This command finds all files in current folder and subfolders, print the name of each file and copy each of them to /dev/null. ...
1
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1answer
223 views

ext4 to btrfs conversion: how many times the whole volume will be read during the process?

I want to convert the 3TB 80% full ext4 block device into btrfs and I want to estimate the time it will take. I understand that this process is disk-bound rather then cpu- or memory-bound. So can ...
3
votes
1answer
2k views

RFC 2544 / Y1564 software implementation

Is there any RFC 2544 and/or Y1564 software available for Linux? I'm aware that tools like iperf, bw-ng and bmon exist, but I was not able to find something that mimics Ethernet tester functionality ...
1
vote
2answers
290 views

dd command: Finding read/write throughput of a flash/SD?

I am running petalinux from sd card. And trying to find data copying rate from Sd card and from QSPI flash that is there on the Xilinx Zynq board. As suggested here , I am doing like this: ...
2
votes
2answers
451 views

Is there a good benchmark for virtual memory performance?

Aside from running memory benchmarks, has anyone used a benchmark that stresses the virtual memory subsystem? I'm curious to see how performance differs in virtual machines with and without EPT ...
19
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3answers
52k views

How can I benchmark my HDD?

I've seen commands to benchmark one's HDD such as this using dd: $ time sh -c "dd if=/dev/zero of=ddfile bs=8k count=250000 && sync" Are there better methods to do so than this?
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2answers
294 views

How can other processes affect measurements made with `time`?

If I time a process using the time command, I get output for 'real', 'user', and 'sys'. My understanding from this discussion is that 'real' is wall time, whereas 'user' and 'sys' are process time. ...
3
votes
3answers
853 views

Best way to benchmark different encryption solutions on my system

I want to compare different encryption solutions for encrypting my system, possibly different solutions for different parts of the system such as /usr or /home. In particular I look at dm-crypt ...
6
votes
2answers
7k views

Benchmark ssd on linux: How to measure the same things as crystaldiskmark does in windows

I want to benchmark a ssd (possibly with encrypted filesystems) and compare it to benchmarks done by crystaldiskmark on windows. So how can I measure approximately the same things as ...
0
votes
1answer
573 views

Floating point performance in Linux

I've tested Geekbench for my computer for both Windows and Linux. It seems that Linux loses markedly in floating point performance. Is there anything I can do about it? Install an optimization ...
3
votes
1answer
228 views

Bandwidth improvements expected from switching to Wayland or Mir?

I was intrigued by this answer regarding why X is not scalable. I'm unable to find any specific speed comparisons between x forwarding on these different protocols. How much % gain in network speeds ...
3
votes
1answer
2k views

Benchmarking Apache using ab

I was doing some performance testing for Apache using ab. Apache in our case is only working as a load balancer balancing load between two Liferay servers. Initially, I did the testing for 1000 ...
1
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2answers
202 views

how to uniformly execute benchmarks on linux

I am doing project on adapting Linux for scalable multi core architecture. I am testing Linux's performance with benchmarks. When I am running the benchmarks in the system then other programs like ...
2
votes
0answers
797 views

MPlayer benchmarking - realtime FPS counter

I was trying to use MPlayer as a simple benchmarking tools and I need it to show the real time FPS counter, either on the console or on the video playback itself. I googled around and I stumbled ...
4
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2answers
2k views

How to benchmark RAM memory with a Linux Distro?

I' ve just bought new RAM and I'd like to benchmark and compare with my old. How can I do that?
2
votes
2answers
7k views

How to test DNS speed?

I am using google open DNS. How can I measure the speed of a DNS server?
1
vote
1answer
133 views

How to configure Linux to run benchmarks as stable as possible?

I have several long running benchmarks (SPEC CPU 2006 benchmarks) to run on a Linux server. The server is running Gentoo Linux with a Linux Kernel 3.6.11. I saw some big differences between ...
1
vote
2answers
744 views

btrfs performance

I decided to mess around with btrfs and found some weird performance anomalies. The tests I've done are with with two external hard drives one formatted with ext4 the other btrfs. ext4 performance ...
3
votes
2answers
833 views

How to adjust time command to measure a program elapsed time

I'm trying to get the time that my program takes to finish (aka elapsed time) so I'm using the common time. What I get by doing this is 3 measurements: user, system and total. This is fine but I ...
3
votes
4answers
2k views

Invoking CPU Stress

Looking for an app or tool to invoke CPU usage on my virtual Linux and Unix guests. I found the app "stress" from a post on Stackoverflow, but curious what the Unix/Linux crowd would recommend.
3
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0answers
722 views

How to check/test internal card reader speed

I got new SD card claimed to be 10 class of speed, but internal Disk utility in linux after test showed up only 6th class of speed. How can I check my card reader speed to be sure that it's not the ...
4
votes
2answers
1k views

VM benchmark tools?

I would like to benchmark of few XEN-constallations: PV DomU HVM DomU with PV network and disk drivers HVM DomU with emulated IDE and PV network The base will be the same VM with the same ...