Reduce size of Task object #55515
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Reduce size of Task object #55515
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Move the registers onto the stack, so that they only are present when the Task is actually switched out, saving memory when the Task is not running yet or already finished. On Linux x86_64 this reduces it from 376 bytes to 184 bytes. Has some additional advantages too, such as copy_stack tasks (e.g. with always_copy_stacks) can migrate to other threads before starting if they are not stick. Also fixes a variable that got mixed up by #54639 and caused always_copy_stacks to abort, since the stack limits were wrong.
…ult during copy_stacks
JeffBezanson
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Aug 20, 2024
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do we have any benchmarks showing the improvement here? |
KristofferC
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Sep 12, 2024
Move the registers onto the stack, so that they only are present when the Task is actually switched out, saving memory when the Task is not running yet or already finished. It makes this mostly just a huge renaming job. On Linux x86_64 this reduces it from 376 bytes to 184 bytes. Has some additional advantages too, such as copy_stack tasks (e.g. with always_copy_stacks) can migrate to other threads before starting if they are not sticky. Also fixes a variable that got mixed up by #54639 and caused always_copy_stacks to abort, since the stack limits were wrong. Also now fixes #43124, though I am not quite confident enough in it to re-enable that test right now.
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Move the registers onto the stack, so that they only are present when the Task is actually switched out, saving memory when the Task is not running yet or already finished. It makes this mostly just a huge renaming job.
On Linux x86_64 this reduces it from 376 bytes to 184 bytes.
Has some additional advantages too, such as copy_stack tasks (e.g. with always_copy_stacks) can migrate to other threads before starting if they are not sticky.
Also fixes a variable that got mixed up by #54639 and caused always_copy_stacks to abort, since the stack limits were wrong.
Also now fixes #43124, though I am not quite confident enough in it to re-enable that test right now.