pft | Page fault test microbenchmark | Architecture library

by gormanm C Version: Current License: GPL-3.0

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kandi X-RAY | pft Summary

pft is a C library typically used in Architecture applications. pft has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

the "overall operation" section is way out of date, sorry. especially since restoration of multi-process version. update is on the todo list. version history below is more or less up to date. "pft" : page fault test. originally by chirstoph lameter. modified by lee schermerhorn [v0.2+] to measure relative overhead of memory policy changes: reference counting, ... see "usage" in program source for command line options. 0.01 - first version of pft_mpol for testing mempolicy fault/allocation overhead. 0.02 - added support for agr [xmgrace] "tag". 0.02a - enhancement to helper scripts to support multiple runs per thread count and added usage string to pft_mpol. general "cleanup". 0.03 - use mmap(map_anonymous) for anon test memory and parent/child comm area. added pft_mmap(), valloc_{private|shared}(), ... for this purpose. 0.04 - in a further attempt to obtain repeatable and accurate results, changed to capture the end rusage in each of the test threads themselves--just after the test loops. 0.05 - add option to set scheduler policy of test threads, including the launch thread to sched_fifo. launch thread will run at one rt (sched_fifo) priority higher to maintain control while starting threads, if nr_threads > nr_online_cpus. n.b., this is fragile. and, sched_fifo seems to introduce a wall clock time delay into the

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Support

pft has a low active ecosystem.

It has 12 star(s) with 5 fork(s). There are 4 watchers for this library.

It had no major release in the last 6 months.

pft has no issues reported. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of pft is current.

Quality

pft has no bugs reported.

Security

pft has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

pft is licensed under the GPL-3.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

pft releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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pft Key Features

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pft Examples and Code Snippets

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Community Discussions

Trending Discussions on pft

SQL Performance degrades on adding INNER JOIN clause in Postgres

Computing Fourier Series to represent data points

Get Latest ModifiedDate Joining Multiple Tables

Ruby on Rails - Losing form values after failed validation on some fields

Extract Meta-Analysis Estimate and Confidence Interval from output for subgroups

How to force List to redraw by another View's toggle Button?

Minifi NIFI S2S

How to separate Parts of Speech tags from Sentences and make them into two separate columns one with the raw sentence and one with only the POS tags

How to retrieve a many-to-many field with backward relationships lookup in Django REST Framework serializer?

Obtaining the single list from iterated string value

QUESTION

SQL Performance degrades on adding INNER JOIN clause in Postgres

Asked 2021-Apr-29 at 13:30

I have the following query

...

ANSWER

Answered 2021-Apr-29 at 13:30

I might be able to tell you a bit about what the planner is thinking here, although I don't know exactly why it goes wrong. In the top 2 nodes of the slow plan, you can see the second one is far higher than the first one (2,234,398.29 vs 20,326.53). So it is thinking the highest value of pbc.id it finds in the last node (patientbillconcession) will be very small, and that it can abandon the 2nd node's execution once the returned value of pft.concession_id exceeds the highest observed value of pbc.id, and that this will happen after doing <1% of the work of the gather merge and the nodes below it. (On the other hand, the expected row counts from the top two nodes are the same, so that seems inconsistent with this "thinks it can stop early" theory, so maybe there is a planner bug here. Can you reproduce this with randomly generated data?).

What can you do about it? First step would be VACUUM ANALYZE everything to make sure you still have the problem with fresh stats.

If that doesn't work, you can use the big guns and just wrap the fast query in with t as materialized (...) and then join "t" to patientbillconcession. But if you have many similar queries with similar problems, it would be a bit tedious to fix them one by one in this way.

If you can share some anonymized version of the data which still has the problem, or better yet a generator script to generate random data which has the problem, we could get closer to a root cause.

Looking at the slowest step of the slowest plan, I wonder if an index on pri (id, createtime) would help avoid hitting the table so often for rows that turn out not to qualify? I suspect that this where the time is actually going, doing those 198,280 random reads. (turning track_io_timing on and repeating could help clarify that part).

Source https://stackoverflow.com/questions/67295989

QUESTION

Computing Fourier Series to represent data points

Asked 2021-Apr-03 at 19:54

I wish to compute a function (a Fourier series) that passes through some set of given points.

Similar to what is going on here https://gofigure.impara.ai/ , but I wish not to animate it. I merely want the function so that I can draw the shape myself. I have read lots of math stuff describing it and code that animates it, but I am struggling with my implementation.

My current code is as follows [should be able to run in a python notebook alone]

...

ANSWER

Answered 2021-Apr-03 at 19:51

There are actually a few issues that need to be resolved to get the expected outline. Let's go over each of those issues.

Fourier coefficient computation

Since you are computing the FFT of the 2D array complexmdpts (each element being an array of 1 complex value), the default behavior of scipy.fft is to compute the FFT along the last axis. In this case it means that you are in fact computing n FFTs of length 1 and given that FFTs of length 1 are identities, the entire computation returns the original array. One solution would be to specify axis=0 explicitly:

Source https://stackoverflow.com/questions/66772493

QUESTION

Get Latest ModifiedDate Joining Multiple Tables

Asked 2020-Nov-26 at 09:26

I have 4 tables

ProjectTable

...

ANSWER

Answered 2020-Nov-26 at 09:26

Given you want the max(modifiedDate) over a number of tables, it would seem that unioning them and the aggregating them is the way to go.

Source https://stackoverflow.com/questions/65018562

QUESTION

Ruby on Rails - Losing form values after failed validation on some fields

Asked 2020-Oct-23 at 16:57

I have a form

...

ANSWER

Answered 2020-Oct-23 at 10:01

In submission_params you probably have something like:

Source https://stackoverflow.com/questions/64497018

QUESTION

Extract Meta-Analysis Estimate and Confidence Interval from output for subgroups

Asked 2020-Sep-21 at 20:02

I am trying to do almost exactly this thing: Extracting meta analysis estimate and CI from output in R

I have metaprop output, and I'd like to extract the confidence interval estimates to put into a dataframe so I can add them to my graph here: Forest Plot, ordering and summarizing multiple variables As a line for summary data.

I've used the double arcsine transformation and so the code listed in that first answer works perfectly if I'd like to get the esimate and CI for the plot as a whole, but I have subgroups. So how would I extract the numbers in green in the photo below, not the red one?

Edit: Update with more information, so per the SE question cited above, you do:

...

ANSWER

Answered 2020-Sep-21 at 20:02

Try this.

Source https://stackoverflow.com/questions/63956230

QUESTION

How to force List to redraw by another View's toggle Button?

Asked 2020-Sep-18 at 21:28

I fetched JSON data from Google Sheet and populate into a List using ForEach. I used struct HeaderView located in another View and place a Button to serve as a toggle. However, the List will not redraw when I press the toggle button even I use @State ascd variable.

Below is some of my code, is there anything I miss?

...

ANSWER

Answered 2020-Jun-03 at 12:20

For changing another View's variable you can use a @Binding variable:

Source https://stackoverflow.com/questions/62170707

QUESTION

Minifi NIFI S2S

Asked 2020-Jun-18 at 14:13

I am trying to connect a miNifi instance on my local computer to a remote Nifi secured cluster.

I connect to this cluster using ssh (Putty) with ports tunneling, so I can access to the remote cluster by https://localhost:8443/nifi.

I have done the following:

Created the template for miNifi (consisting of a generate flowfile processor and an RPG (https://cluster-nodes-names:8443/nifi). Inputs ports are detected, great !
Converted this template using miNifi toolkit
Added to miNifi config.yml, the trustore and keystore, and nifi-cert.pem generated; with the following command:

tls-toolkit.sh client -c -t -p -D "CN=test, OU=NIFI" -T PKCS12 --subjectAlternativeNames localhost
Added the following user to Nifi : "CN=test, OU=NIFI"

When I run miNifi I got the following error:

Certificate for '<'localhost'>' doesn't match any of the subject alternative names: [pft.com, pft.com]

I am kind of lost with TLS / SSL configuration, and I am not really sure that what I want to achieved is possible.

I will greatly appreciate your help!

...

ANSWER

Answered 2020-Jun-18 at 14:13

I solved my problem. Maybe it will help some:

I guess a secured cluster have pre-registred nodes names, such It didn't reconized localhost as a certified node; that is why the error was thrown.

What I did is changing in the system, the localhost name to the node name. Such I can acces to the cluster by https://cluster-nodes-names:8443/nifi. Et voila!

Source https://stackoverflow.com/questions/62450832

QUESTION

How to separate Parts of Speech tags from Sentences and make them into two separate columns one with the raw sentence and one with only the POS tags

Asked 2020-Apr-15 at 23:23

so I have a Bangla Parts of Speech Data-Set which looks like this:

...

ANSWER

Answered 2020-Apr-15 at 23:23

Following is an English example solved. The forward slashes are replaced with backslashes so as to be in line with the Bangla text provided.

sample data for this code:

Source https://stackoverflow.com/questions/61233557

QUESTION

How to retrieve a many-to-many field with backward relationships lookup in Django REST Framework serializer?

Asked 2020-Jan-31 at 04:03

Please correct my title if it's not correct. My problem is I want to retrieve FinishType's name from Product. I have tried 2 ways to achieve this: first attempt and second attempt.
My simplifed related models in models.py:

...

ANSWER

Answered 2020-Jan-30 at 12:21

Create a serializer for FinishType,

Source https://stackoverflow.com/questions/59984942

QUESTION

Obtaining the single list from iterated string value

Asked 2019-Oct-04 at 10:34

I have list

...

ANSWER

Answered 2019-Oct-04 at 10:34

you can use list comprehension :

Source https://stackoverflow.com/questions/58234259

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