Thread is a form of a process to divide itself into two or more tasks that can be executed concurrently.

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Why a quad-processor with enough free RAM and low CPU usage become very slow?

In a computer with Intel Core i3 and 4GB of RAM running Windows 8.1 build 9600, in conditions I expect no have performance problems it become very very slow and it's close to freeze (or even freeze ...
6
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2answers
219 views

Unexpected shutdown with heavy single threaded process and single core affinity

I'm not sure what's the cause of the problem, but it happened 3 times in two weeks under similar conditions. I checked with the laptop's support desk and they made me run several tests to see if my ...
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1answer
39 views

Get username of a thread

How to gather the username/SID/account of a particular thread? No, I am not looking for account of the process, but of specific thread. I've looked-up Process Explorer, but it doesn't show ...
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2answers
9k views

what does 2 core 4 threads mean in cpu?

I wanted to know what does 2 cores 4 threads mean about a cpu? I am talking about this cpu which i have http://ark.intel.com/products/47341/Intel-Core-i5-520M-Processor-3M-Cache-2_40-GHz I initially ...
7
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2answers
4k views

Does GNU/Linux counts processes and threads together when I limit their number?

I want to limit the number of processes per user on my machine, with /etc/security/limits.conf and the nproc value. I have read here that Linux dosen't distinguish between processes and threads? My ...
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0answers
49 views

setting affinity for multiple cores on dual cpu system

We are using some systems with 2cpu's with 6 cores/12 threads each so 24 threads in total, for quite a lot of multitread simulations. Because the problem doesnt scale perfectly, i usualy run 4 ...
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1answer
30 views

Trying to link boost.thread with Xcode

I have built Boost from the website using ./bootstrap.sh ./b2 install I think all are installed properly. I am trying to use Xcode to include the library of boost:thread.My code links to the ...
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1answer
61 views

Why are there 3 chrome.exe processes immediately upon launch?

I am aware that chrome.exe uses a new process per browser tab, but why do I get 3 chrome.exe processes in the process list immediately upon launch?
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0answers
145 views

Jenkins realtime console output for parallel threaded fabric command

We have a Python fabric command that runs in parallel across several hosts, something like this: $ fab --hosts=prod1.server,prod2.server,prod3.server --parallel copy_cache This will copy cache to ...
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1answer
35 views

Can threads from the same process run at the same time, on a multicore systems?

I searched the web and the answers I found were tentative. That is, people thought this is what happens but were not sure. Assuming the proper precautions were taken to synchronize and prevent ...
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1answer
48 views

Efficient Multi-thread downloading? [closed]

My downloading speed of files is not fast enough.. Is there any way to add more thread in a single download? Thank you for answering this.
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0answers
19 views

Show all running tasks in Assembly

Is it possible to show/log everything what the CPU does? The CPU knows what it executes, so it could print the running threads/tasks on the screen or in a file.
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5answers
6k views

how can force a prgram to use all of CPU capacity?

I have Windows 7 And a Intel Core-i5 CPU (4Thread) some programs like Firefox, only use up to maximum 25% of All CPU(only 1 Thread) And some programs like Winrar, use up to 100% of All CPU Can ...
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1answer
182 views

how to make Apache 2.4 work in single worker mode by default?

I'm using Apache 2.4 on my server. My scripts are using a lot of system() commands and they require to work in one process mode. When I start apache using the command: apachetctl -X (which ...
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0answers
21 views

Are there two seperated schedulers in major operating systems, one for processes and one for their threads?

Let's assume a process is given the CPU on a single-core CPU system by the scheduler and let's assume this process has 10 threads. Who decides which of the ten threads gets the CPU? In other words, ...
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0answers
1k views

CPU usage always around 40% because of wait-chain?

I am facing a very rare problem and it's causing much trouble. Whenever I boot my PC(HP 2000-2116tu, Win7, 4GB mem), there is a set of processes(legitimate ones and not virus), one of which starts to ...
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1answer
100 views

How many threads are concurrently executed?

The output from WMIC: C:\Users\fra>WMIC CPU Get DeviceID,NumberOfCores,NumberOfLogicalProcessors DeviceID NumberOfCores NumberOfLogicalProcessors CPU0 4 8 C:\Users\fra> ...
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1answer
253 views

Command-line Number of thread per process on MacOS

I'd like to be able to get the number of thread per process in command-line and get the exact same number I can see via the Activity Monitor. At the moment the IntelliJ IDEA process (PID 5235) has ...
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1answer
135 views

Cores and threads? How does it all work exactly?

I am confused by this ... if a CPU has 2 logical cores, it can run two programs 100% concurrent, yes? Otherwise, 2 programs on one CPU must be 100% time-divided (can't run independently as the same ...
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0answers
23 views

Is parallelism in computer science always directly tied to the number of processor cores?

Specific to the Java programming language, would it be accurate to say that two threads can be concurrent, but can only truly be run in parallel if there are two or more cores?
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0answers
81 views

How does Windows affinity work with hyperthreaded CPUs?

Let me describe our requirement in detail. We are doing some kind of assignment which requires capturing of IP data through NIC card and then processing the captured data in real time. The processing ...
0
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0answers
12 views

Tomcat 5 keeps jumping between threads for no reason

I have Tomcat 5 server running on Windows Server 2003 with JDK 1.6.03 hosting one custom made webapp. App worked fine, but some time ago it started hanging for no reason. I connected via JMX and ...
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4answers
4k views

What's the best way to perform a parallel copy on Unix?

I routinely have to copy the contents of a folder on a network file system to my local computer. There are many files (1000s) on the remote folder that are all relatively small but due to network ...
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0answers
107 views

How to change limits of non-interactive process?

I am trying to change the RTPRIO limit of a process that's run at startup. I have found 3 ways to change process interactively: setrlimit ulimit /etc/security/limits.conf However these only seem ...
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0answers
45 views

Command to get associated threads for pid in OSX

In Linux I can use one of the following ps -p pid -L -o pid,tid,%cpu,%mem ps -C command -L -o pid,tid %cpu,%mem What is the equivalent command for OS X ?.
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1answer
190 views

Launch each Windows Explorer window in a separete process

Win7 Win64. I configured Windows Explorer in Tools > Folder Options > View > Launch folder windows in a separate process. It is checked, to make sure I rebooted Windows and it was still checked. ...
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2answers
14k views

How do I monitor or view the thread count of a certain process on AIX?

How do I monitor or view the thread count of a certain process on AIX?
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2answers
661 views

Configuring systemd to allow daemon to set RT priority

I have a daemon that calls pthread_setschedparam() to set the thread priority. On a system using systemd (OpenSuse 12.1), this fails, because sched_setscheduler() returns EPERM. From what I ...
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1answer
72 views

Windows 8.1's audio service chokes on threads and handles?

-- snipped as the hibernation thing seems to be invalid now -- Edit: I found this... This process is using 52,552 handles and 6,065 threads when I took the screenshot. At the time of writing, 52,913 ...
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3answers
63 views

Multiple CPUs, multithreaded performance

My program: 100% CPU and RAM based, performs mathematical calculations, reads the data from the HDD into RAM in the beginning. No communication between threads. The threads, all take the same time ...
0
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0answers
368 views

ProRes transcoding in ffmpeg too slow

We are trying to transcode movies / clips into ProRes LT by using following options: ffmpeg -threads "16" -i "$2" -flags +ildct -vcodec prores -profile 1 -qscale 4 \ -threads "16" -r 24 -vf ...
6
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3answers
1k views

Can I close a firefox tab through the console?

There I was downloading a bunch of stuff from the Internet quite happily using Firefox built-in download manager when I decided to check code academy (a site that teaches you how to program in ...
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1answer
728 views

Why are user level threads faster than kernel level threads?

I found out that user level threads are a lot faster than kernel level threads but I could not find any convincing example of WHY is user level threads are faster than kernel level threads ? Could ...
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2answers
2k views

What Exactly is a Threaded Web Server?

I would like to know what a threaded web server is? I have performed many searches but am unable to find anything that gives a clear explanation or definition; perhaps somebody can enlighten me.
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3answers
133 views

Single threaded process being executed on 2 cores

On my quad core cpu, it seems like a single thread (endless while loop) is being executed on 2 cores simultaneously. Why is this? Shouldn't a single thread be executed on one core only?
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1answer
146 views

Use all processor cores, 1 core/per 1 thread in *nix

According to xz documentation the "-T 4" means I should be using 4 threads, each compressing a different part of the file simultaneously. Before using nice -19 I would only get %50 usage of 1 core, ...
2
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1answer
359 views

Installing ffmpeg (namely fdk-aac) on cPanel server causes issues with perl threads

Basically, I'm trying to install FFMPEG on a cPanel server. I'm able to get everything installed and working (tested using ffmpeg -v) except for libfdk-aac. I can do the git clone and everything ...
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1answer
60 views

i3 3210 do all 4 threads run at once

windows 7, task manager show%s thread 1,2,3 all running around 40% thread 4 is at 2%. Is this normal? i3 3210 windows 7 8GB DRAM cpu running at 35% per task manager
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1answer
358 views

Blocked process state affect on thread state within process?

If multiple threads are running within a process and the process goes from running to blocked state then do all the threads within the process automatically go into blocked state as well? If the ...
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3answers
2k views

Task Manager is saying the system is running with over a thousand threads

I opened up Task Manager and looked under the "System" area and saw: Threads: 1337 Since I have a dual-core processor with hyper-threading available (meaning four threads), how is it possible to ...
2
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2answers
1k views

Why is it quicker to switch between threads than to switch between processes and share data between them?

Why is it quicker to switch between threads than to switch between processes and share data between them? For example, in the apache web server running on ubuntu can use either the Prefork MPM ...
0
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2answers
202 views

Cores, threads and multi-processing

I know all this terminology is a confused field atm, but I'm trying to interpret how they are being used at: http://www.cpu-world.com/CPUs/Xeon/Intel-Xeon%20E7-8870.html The context I've got is that ...
22
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9answers
79k views

how do you view all threads running on Linux?

I've used 'top', but I need a tool that can give me an arbitrary-time history of threads that have executed on my system (CentOS 5.4)?
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1answer
341 views

Is it faster to run one process that spawns N threads or to run N processes?

I need to run ~1500 jobs on my lab's server. The program I am using (blastpgp if anyone cares) is capable of running in parallel mode, the "-a" option sets how many threads it will launch. The server ...
0
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2answers
2k views

Can a single process be executed in two or more processors in a multiprocessor system?

I have heard that one processor can work on only one process at a time. Is this true? If so, then how can a single process be executed in more than one processors at a time? Is this even possible? ...
1
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0answers
132 views

Is it possible to find what's “choking” Firefox?

Is it possible to find what exactly is causing Firefox to randomly CPU-spike at 13%, freezing it entirely? And by "exactly", I mean finding what functions/calls/modules/threads/drivers are the direct ...
1
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1answer
113 views

When a thread is created, how is the initial context determined? [closed]

How is a thread's initial context (registers state) determined on thread creation? For example: Current thread context eax=0x4, ebx=0x9000, ecx=0xfff, etc... Create a thread is called to begin ...
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2answers
93 views

What do you call the “action of” striping threads across multiple processors? [closed]

A question of curiousity, I understand [one thread per core] or with time slicing, [many threads one core] But, is there a way even through emulation, even with a performance cost, to... how to say... ...
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2answers
2k views

AMD FX Series: 8 cores or 8 threads in 4 cores?

I've looked at FX-8XXX series processors on Windows, and they show as 4 core, dual-threaded processors. (4 cores w/ 2 threads per core) The processors are advertised as 8-core. Do they actually have ...
2
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3answers
840 views

Running threads on a non hyper-threading Intel processor

Intel Pentium Processor E5700 (2M Cache, 3.00 GHz, 800 MHz FSB) does not have hyper-threading but it has has 2 cores so I am assuming it has 2 threads Now if I write a heavy number crunching program ...