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multithreadingtcl
Jonjilla
Jonjilla

Reputation: 463

Are Tcl threads multi process/multi core

I'm new to using threads in tcl but thought it was a nice way to solve a problem I'm having

I was trying to read through the tcl thread documentation but i can't quite figure out if tcl threads span threads across multiple cpu cores or try to keep all threads within the CPU core from which the master process was started?

Upvotes: 0

Views: 470

Answers (1)

Donal Fellows
Donal Fellows

Reputation: 137807

Tcl's threads are threads as supported by the operating system's standard libraries (e.g., they're normal POSIX threads on Linux and OSX), and so are entirely capable of running over as many cores as the OS allows.

Tcl takes care to limit the use of locks in its implementation as much as possible, so as to make multi-core operation as efficient as possible; this came from experience supporting high-performance application servers in the 1990s, where it turned out that reducing the sharing of resources was a big win as hardware scaled up the number of cores.

It also means that you've got a non-shared memory model based on structured message passing; it scales well, but it was very different to what most programmers knew at the time. It's a little bit more mainstream now because shared-memory parallelism remains annoyingly troublesome on modern hardware.

Upvotes: 3

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