On Mon, May 13, 2019 at 8:49 PM Joel Scarfone <joelrscarf...@gmail.com> wrote:
>
> Hi All! I have a very simple program as follows that just creates an isolate,
> then sleeps:
>
> #include <libplatform/libplatform.h>
> #include <v8-platform.h>
> #include <v8.h>
>
> #include <stdio.h>
> #include <unistd.h>
>
> using v8::Isolate;
>
> int main() {
>
> std::unique_ptr<v8::Platform> platform =
> v8::platform::NewDefaultPlatform();
> v8::V8::InitializePlatform(platform.get());
> v8::V8::Initialize();
>
> v8::Isolate::CreateParams create_params;
> create_params.array_buffer_allocator =
> v8::ArrayBuffer::Allocator::NewDefaultAllocator();
> Isolate* isolate = v8::Isolate::New(create_params);
>
>
> printf("Sleeping...\n");
> usleep(1000 * 1000 * 100);
> printf("Done\n");
> return 0;
> }
>
> When i run this program, i can then check the number of threads the process
> has created with ps -T -p <process_id>, and i see that on my 8 core machine,
> v8 creates 7 extra threads all named "V8 WorkerThread", and on my 16 core
> machine i get 8 instances of this "V8 WorkerThread" created.
>
> I am looking to understand what determines the number of extra threads v8
> spawns and what the purpose of these threads are. Thanks in advance!
>
> Joel
V8 spawns those threads for off-thread concurrent (re)compilation and
garbage collection.
You can pass a `thread_pool_size` argument to NewDefaultPlatform() to
configure its size (0 == default size == max(1, min(8,
number_of_cpus-1))) or plug in your Platform implementation.
You can also pass `--predictable` or `--single_threaded` to
V8::SetFlagsFromString() to disable the thread pool but you'll
probably take a performance hit when you do. Hope that helps!
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