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by DannyBee 4851 days ago
Good to hear it's gotten better. Admittedly, I wasn't thinking about browser based JITs when I said that :)

I'm actually curious if you have any stats on how much of the time this is being done on actual busy machines where it's going to compete for L1/etc resources vs how often it's able to be offloaded onto an otherwise empty core.

IE i expect their to be a significant difference in the use cases for JIT's like PyPy, which are probably going to sit on shared servers that folks are trying to maximize utilization of, vs desktops where I imagine most browsing probably doesn't use all cores at 100%.
1 comments
antrix 4851 days ago
> Admittedly, I wasn't thinking about browser based JITs when I said that :)

Don't HotSpot and JRockit also do background (de)compilation & swapping of generated code?

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DannyBee 4851 days ago
Yes, but in hotspot's case I cannot remember if it is actually turned on in both "server" and "client"
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pjmlp 4851 days ago
Aren't server and client not now merged with tiered compilation in Hotspot?
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DannyBee 4850 days ago
No, AFAIK. "Tiered compilation, introduced in Java SE 7, brings client startup speeds to the server VM. ... Tiered compilation is now the default mode for the server VM. "

Again, AFAIK, the server VM still has a significantly different set of tuning than the client VM. In particular, it runs some significantly more complex opts that the client VM does not.

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