likwid | Performance monitoring and benchmarking suite | Performance Testing library
kandi X-RAY | likwid Summary
kandi X-RAY | likwid Summary
Likwid is a simple to install and use toolsuite of command line applications and a library for performance oriented programmers. It works for Intel, AMD, ARMv8 and POWER9 processors on the Linux operating system. There is additional support for Nvidia GPUs. There is support for ARMv7 and POWER8 but there is currently no test machine in our hands to test them properly. For further information please take a look at the Wiki or contact us via Matrix chat LIKWID General.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of likwid
likwid Key Features
likwid Examples and Code Snippets
Community Discussions
Trending Discussions on likwid
QUESTION
I am trying to create a multiple moving average script in TradingView Pinescript. Unfortunately, it keeps throwing the error:
Script could not be translated from: ["EMA","SMA","WMA","HMA","LIN"]
I can't seem to figure out if my syntax is incorrect or if there is something else that I'm missing.
Any help anyone can provide would be greatly appreciated.
...ANSWER
Answered 2021-May-14 at 19:49The script was missing //@version=4 on the first line.
I've also adjusted the // Moving Average plots section a bit, because you can't use fill() between 2 series.
You can only use fill() between plot() and hline() objects.
QUESTION
I would like to measure the Integer calculation performance of a code that performs sparse matrix-matrix calculations. Are there performance counters on Intel CPU similar to those for float/double calculations?
More specifically I would like to count Integer additions, multiplications, fused add/mul and comparisions. But any subset will be helpful.
I couldn't find any such events when using likwid-perfctr to read performance counters.
...ANSWER
Answered 2018-Feb-17 at 22:54It depends on the CPU. You can check the complete list of available performance events in different microarchitectures here. There could be events for both integer and floating-point operations or for just integer operations. For example, on Nehalem, ARITH.DIV and ARITH.MUL count the number of integer and floating-point divisions and multiplications executed, respectively. There are also the SIMD_INT_* performance events for counting only integer SIMD operations. On Skylake, the only event that might approximate what you need is ARITH.DIVIDER_ACTIVE, which counts the number of cycles when the divide unit is busy executing both integer and floating-point divisions.
Generally, you can search for events that have INT in their name or integer in their description. You can find most of the events this way, but not all of them.
You should be very careful when using these events. You should understand how they work when SMT is enabled, exactly what is being counted and what is not, and how fused add/multiply operations are treated. Unfortunately, the documentation tends to be vague in that regard, so you may need to experiment with them first.
QUESTION
I have been using likwid (link) for accessing performance counters in my dual socket Intel Xeon E5 2660 v4 processors. I was able to use the tool (likwid-perfctr) successfully until last december. When I got back to the tool today after almost a month, I am getting the following warning:
WARN: Counter PMC0 is only available with deactivated HyperThreading. Counter results defaults to 0.
WARN: Counter PMC1 is only available with deactivated HyperThreading. Counter results defaults to 0.
WARN: Counter PMC2 is only available with deactivated HyperThreading. Counter results defaults to 0.
The problem persists even after enabling/disabling hyperthreading from BIOS. Additionally, I get this error even when I run the perfctr command as root.
Has anybody run into this issue? Was there any recent kernel update that makes it difficult to read the MSR registers (which could explain the appearance of the warning message in the last month)?
System Information: Debian Stretch, kernel 3.16, likwid version 4.3, and finally the command I am trying to run
likwid-perfctr -C N:0-27 -g L3CACHE -m executable
ANSWER
Answered 2018-Feb-07 at 05:46The above problem has been fixed in commit 03422ed of likwid. The problem was due to incorrect ifdefs which was causing likwid to read the number of performance counters incorrectly
Link to answer in the likwid-user google group - https://groups.google.com/forum/#!topic/likwid-users/oe2ch0aHONY
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install likwid
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
