I'm investigating SEGVs like 2715166621.
Because a lot of things are going on on this line, it's hard to identify
the cause, especially because we can't get the core file of the failures.
Therefore I intentionally increased the number of lines for
investigation.
Compiling everything seems to contributed to improving the final
performance in general. MJIT's compilation is slow anyway, especially
when you need to wait for JIT compaction.
This might make sense for short-time benchmarks like Optcarrot with
default parameters, but it didn't give benefits in my local environment.
The previous behavior depending on exact float values, it seemed
to work OK on amd64 and i386, but other CI platforms are
experiencing non-deterministic test failures with it. Relax test
slightly to hopefully pass on such platforms.
Depending on the float range, there could be an off-by-one error,
where the last result that should be in the range was missed. Fix
this by checking if the computed value for the expected value
outside the range is still inside the range, and if so, increment
the step size.
Fixes [Bug #16612]
The checkmatch instruction with VM_CHECKMATCH_TYPE_CASE calls
=== without a call cache. Emit a send instruction to make the call
instead. It includes a call cache.
The call cache improves throughput of using when statements to check the
class of a given object. This is useful for say, JSON serialization.
Use of a regular send instead of checkmatch also avoids taking the VM
lock every time, which is good for multi-ractor workloads.
Calculating -------------------------------------
master post
vm_case_classes 11.013M 16.172M i/s - 6.000M times in 0.544795s 0.371009s
vm_case_lit 2.296 2.263 i/s - 1.000 times in 0.435606s 0.441826s
vm_case 74.098M 64.338M i/s - 6.000M times in 0.080974s 0.093257s
Comparison:
vm_case_classes
post: 16172114.4 i/s
master: 11013316.9 i/s - 1.47x slower
vm_case_lit
master: 2.3 i/s
post: 2.3 i/s - 1.01x slower
vm_case
master: 74097858.6 i/s
post: 64338333.9 i/s - 1.15x slower
The vm_case benchmark is a bit slower post patch, possibily due to the
larger instruction sequence. The benchmark dispatches using
opt_case_dispatch so was not running checkmatch and does not make the
=== call post patch.
It looks for "checkmatch", when it could be applied to anything that has
"newrange".
Making the optimization target more ranges might only be fair play when
all ranges are frozen. So I'm putting a reference to the ticket that
froze all ranges.
[Feature #15504]
