The process of running a computer program to assess performance.

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Is shred single pass less secure than srm?

i compared shred -n 1 -v --random-source=/dev/zero file.txt and srm -llvzd file.txt on 16gb file on hdd. ubuntu 14.04. both commands do single pass with zeros. 'srm' needed more than whole night ...
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9 views

Enable fine grained, thread level timings for benchmarking?

I need to perform some benchmarking on Linux, and I'd like to use Fedora or Ubuntu. Linux kernels don't provide fine-grained, thread level timing information. About all I can get is process times. ...
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0answers
11 views

Finding maximum number of VMs that we can run on a machine

Goal Goal is to find out total number of VMs that we can run on my machine which are generating given amount of load. Problem I want to generate some load inside the VM, say 25% of alloted cpu, 10 ...
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2answers
83 views

Intel RS3UC080(LSI3008) + Samsung Evo 840 = slow writing performance?

I am getting pretty slow writing performance in comparison with my Z87 board. Does anybody know if these results are to be expected out of the Intel RS3UC080 or what the problem might be if there is ...
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3answers
38 views

Is there anyway to produce realistic load(cpu,memory and disk all together) on a linux system?

I am using Ubuntu 12.04 and I want to stress test my system but most of benchmarks are specific in nature. Either they are benchmarking Disk or CPU or Memory usage etc. But is there anything which can ...
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42 views

Extreme speeds from a hard drive that shouldn't be this fast?

I have a Seagate 7200rpm drive and for some reason ATTO Disk Benchmark concludes that this drive is around 220 MB/s read and write. Isn't this unrealistic for a drive of this kind? ATTO displays the ...
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20 views

How to implement Intel MPI benchmarks for mpich2?

Many people have recommended the use of Intel MPI benchmarks for mpich2, however the installation is not very simple. Could anyone provide steps for the installation and sample test case for it? Which ...
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1answer
63 views

Why is different throughput using netperf?

I am using netperf on Windows OS, with two computers connected with cross-over cable. First PC is using a Realtek FE network controller, and second PC has a Realtek GBE controller. With the first PC ...
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70 views

Running Linpack on Linux High performance computer

I am trying to do some benchmarks on Linux HPC machine which specs are as following Total CPUs: 160 cores using latest 16C AMD Opteron Processors Total main memory: 640 GB of 1600MHz Total GPUs: 1024 ...
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1answer
46 views

Bench-marking my SSD gives unreasonable number

I have a SAMSUNG 840 EVO SSD (120GB) installed on my laptop. According to the SAMSUNG website, it has 520 MB/s max read and 500 MB/s max write (sequential). I am trying to benchmark it using ...
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103 views

How important is the 4k speed test for real world applications, in a USB flash drive? [closed]

So I am evaluating which flash drive to buy, and at the moment I am considering some USB 3.0 drives, which has a similar sequential R/W value. The difference is that for the 512k test, the values are ...
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1answer
391 views

SATA III vs. SATA II…getting two different pieces of information

I recently purchased the Samsung SSD 850 EVO 250GB to replace my (rapidly filling) 64GB OCZ Vertex 2. The drive installation went very smoothly - I was extremely happy with that. However, after I ...
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2answers
2k views

Performance difference between SD and MicroSD cards?

If you compare a MicroSD card with an advertised speed of 48 MB/S to a full size SD card with an advertised speed of 48 MB/S (from the same manufacturer), should their performances be identical? Or ...
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1answer
138 views

Why is my hard drive slowing down halfway through a read/write benchmark?

I'm using gnome-disks to do a benchmark on an old 5400RPM Hitachi HDD that I pulled from a PS3. It's connected to my computer through an external USB 3.0 enclosure. Here's the output graph from the ...
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0answers
37 views

Monitor disk I/O used by specific command

I know that there are various tools for monitoring disk I/O, but I am wondering specifically if there is something equivalent to time for disk usage? For example, I am benchmarking a specific command ...
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0answers
179 views

What is Prime95 benchmarking?

I've recently had to benchmark the CPU performance of a variety of operating systems on identical machines. I've been using the 'benchmark' functionality of Prime95 to obtain a consistent test. I've ...
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2answers
2k views

Periodic FPS drops in games, regardless of graphis card

When I play recent 3D games (Battlefield 3 & 4, Tomb Raider, Saints Row 3 & 4, etc.) I experience periodic FPS drops, e.g. in Battlefield 3 from the average of around 70-80 fps to 20-30 fps; ...
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2answers
92 views

Bash parameter Expansion: Best practices for speed?

I was just wondering if anybody knows any best practices or if there is any documentation about this topic: The scenario is searching / grepping in the log files. To make my point I will use ls. So ...
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22 views

Low Memory Performance

I am currently benchmarking some of my code to see where the bottleneck is. My memory is DDR3 1066MHz DualChannel Mode This should result in 17GB/s peak memory performance. With my code I am ...
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2answers
75 views

How to correlate CPU benchmarks to overall computer performance? [closed]

I am in the market for a new PC, and I know I can look up the CPU model name to see which one performs better in a benchmark test. However, how do I translate this into PC performance? What sort of ...
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1answer
268 views

How to tell, before buying, if a given graphics card will play Full HD video?

I am looking for the cheapest video card that would be capable of smooth playback of Full HD (1080p) video on a Full HD screen. An answer by @Mikhail on a related question briefly mentioned that: ...
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283 views

Comparing an i7 (3.2Ghz) against an i5 (2.5Ghz) using linpack shows the i7 being worse

I am trying to compare the number crunching performance of an i5-3210M @ 2.5GHz with 6GB ram and an i7 970 @3.2GHz with 24GB ram. The results are so unexpected I presume I am either doing something ...
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1answer
57 views

Benchmark performance 30% speedup in mains over battery operation?

This observation arose as I was evaluating the running time efficiency of various implementations of a prime sieve algorithm. The surprise was finding that differences between the best algorithms was ...
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22 views

Is there a way to run a job exclusively on a chip?

We've got a bunch of large (1TB+) NUMA machines at work and have been getting a lot of noise in benchmarking. We've noticed that run times for our application are very consistent from one run to the ...
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28 views

USB bench marking shows faster write speeds after fragmentation? How? [duplicate]

I am currently benchmarking my 3.0 USB Flash drive both fragmented and defragmented. My initial setup consisted of Crystal Disk Mark and a flash drive with no files on it. I recorded the output ...
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1answer
87 views

MIPS as a measurement of raw integer data processing

I'm looking for a way to contextualize generational differences in computing performance. Is this a correct application of the MIPS measurement? MOS 6502 - 0.500 MIPS at 1 MHz. As an 8-bit CPU it ...
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880 views

Disable all disk cache features in Windows 7

I am doing benchmarking of several algorithms involving read/write to disk. As Windows provides some cache features, sometimes I get results like these : first run of the algorithm : 200 seconds ...
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2answers
321 views

SD card speed differences

I'm trying to benchmark a micro SD card, and in the process it seems that my laptop's card reader is to blame, but I would like to make more experiments to be sure of it. I have a supposedly Class 10 ...
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1answer
347 views

Clues to guess CPU performance for single-threaded tasks

Can one somehow guess how for example Intel Core i5-3320M @ 2.60GHz (dual core) and Intel Core i7-3612QM @ 2.10GHz (quad core) would compare on basic single-threaded tasks? I know this is problematic, ...
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1answer
46 views

Low benchmark= faulty or slightly faulty cpu?

If a phone/computer scores slightly lower on a benchmark than the rest...not drastically but significant enough to be noticed could the cpu be damaged? What I am asking is that if a cpu is damaged ...
2
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2answers
2k views

Test disk write speed on existing partition

I want to benchmark write speeds on a disk in an existing server setup. I suspect there is a problem with the write perf of the controller. Benchmarks I have tried (SiSoft Sandra, HDTune) report that ...
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1answer
283 views

Why the here-strings in bash are slower than piping the input to a command?

I compared the execution time for unix here-strings and pipe data input to bc: pipe time for i in {1..1000} do echo "sqrt(5.09)" | bc -q > /dev/null done real 0m3.584s user ...
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1answer
73 views

How can I decide real vs virtual cores if i need intensive calculus?

Assume that I have a computer called A with a processor that has two cores and has hyperthreading, i.e it has 2 cores with 4 threads (I understand that this can supply to 4 processes simultaneously), ...
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1answer
270 views

Multi-threaded execution of simple perl/python script

Some years ago a friend created a 'benchmark' (Note: Not a benchmark) by which wouldwhich we measure one raw aspect of computing power. Namely how fast (or indeed slowly) the computer could count to ...
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1answer
775 views

Why are some computers are slow during file copy process?

I have a modern laptop (quad-core i5 2.5GHz, 4GB RAM, ) at work. But it is very slow and unresponsive when I copy files in the background.On the other side, at home I have a simple 2-core PC (E2180 2 ...
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2answers
6k views

ZFS raidz2 performance issues read/write speeds on Freenas

I'm having some performance issues on my home backup FreeNas box using a raidz2 configuration and I am wondering what might be causing it (not enough processing power, eco drives?). It's running: ...
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2answers
839 views

Is it necessary to tweak config for a new SSD?

I've read some years-old posts that say you should tweak some options in Windows to get the best performance. But then I read that this is no longer necessary with today's SSDs. I installed a new ...
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3answers
6k views

Why the results of Truecrypt and cryptsetup (LUKS) benchmarking are so different?

I want to encrypt a part of my HDD. But before that I wanted to benchmark the different algorithm available wondering if I should choose aes-xts-256 or aes-xts-512. Note: I don't have aes hardware ...
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0answers
103 views

How to benchmark hard disk? [duplicate]

I am trying to benchmark my hard disk and find the throughput in Mb/s and latency in milliseconds. This is my code: public class OneMB implements Timer { public static void main(String a[]) throws ...
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3answers
4k views

Is there a list of graphics cards ordered by relative performance? [closed]

I'm struggling to make sense of graphics card manufacturers' cryptic names and codes for their products. For example, some cards with a higher number or code in the name are actually less powerful ...
4
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2answers
836 views

What does the file /proc/cpuinfo tell me about the hardware?

I rent a server which should have "2 Cores x 2,2 GHz". When in run the command cat /proc/cpuinfo I get the following result: processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : ...
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1answer
206 views

Is bigger capacity ram faster then smaller capacity ram for same clock and CL?

I know that bigger capacity hard-drives with the same RPM are faster then smaller capacity hard-drives. I was wondering if the same is true for ram. Given two ram clocked at 1600mhz and with identical ...
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1answer
71 views

Find out information about installed hard- and software using the terminal without admin rights

I have access to a remote server, to which I login via ssh. I don't have admin rights, but I like to find out as much as possible about the machine, among other things to see If I get what I pay for. ...
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344 views

Why is the clock speed readout greater than the maximum?

(click for full-size image) What is this madness? (I'm aware that the top number refers to the non-Turbo Boosted clock speed, but what of the others?)
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2answers
1k views

Poor performance of single processor 32bit Windows XP xompared SMP in VBA+Excel

Welcome! On many computers I experienced poor performance of 32 bit guests running on 64 bit Linux host (I used only the Debian family). At last I managed to collect benchmark data. I made the ...
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1answer
371 views

Intel's i7 2700k vs 3770k on Ram Frequency

The major difference (IMO) between the two is the max RAM frequency. 2700K = 1333 MHz 3770k = 1600 MHz Will this make noticeable difference and if yes in what type of applications will I ...
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2answers
210 views

Do uninterruptible power supply increase the life expentency of hardware?

Do UPS increase the performance or life expectancy of the hardware connected to it? What if the UPS has a built in line conditioner?
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1answer
2k views

How do I tell which desktop CPU is best for virtualization with 6-8 virtual machines?

I am looking to run between 6 and 8 virtual machines, each running Windows XP. Each virtual machine would run Magic Online (MTGO) and a few scripts for data sharing. The host itself would run nothing ...
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1answer
64 views

Searchable disk benchmarks

I'm trying to find a web site that has a searchable database of hard drive, SSD, and flash drive benchmarks. Ideally I could search by model number and get the following information: Seq read max, ...
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2answers
2k views

Is sleep mode harmful for a computer?

For the last 1.5 years I've tended to put my laptop in sleep mode rather than turn it off. Recently I started to feel it's not as fast as it was when I bought it, even if I restore a fresh Windows 7 ...