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Interestingly Google went ahead and made their own version of Bolt after it was already open source. It's called Propeller and it had some purported advantages
by fooker 2y ago
Interestingly Google went ahead and made their own version of Bolt after it was already open source.
It's called Propeller and it had some purported advantages afaik.
Anyone know if such large scale experiments have been conducted with this for the sake for comparison?
- canucker2016 2y agoMore info about Google's Propeller, from https://lists.llvm.org/pipermail/llvm-dev/2019-September/135393.html https://lists.llvm.org/pipermail/llvm-dev/2019-September/135...: While BOLT does an excellent job of squeezing extra performance from highly optimized binaries with optimizations such as code layout, it has these major issues: * It does not take advantage of distributed build systems. * It has scalability issues and to rewrite a binary with a ~300M text segment size: * Memory foot-print is 70G. * It takes more than 10 minutes to rewrite the binary. Similar to Full LTO, BOLT’s design is monolithic as it disassembles the original binary, optimizes and rewrites the final binary in one process. This limits the scalability of BOLT and the memory and time overhead shoots up quickly for large binaries.
- maxpan 2y agoDisclaimer: I'm an active developer of BOLT. It takes BOLT less than 10 second to optimize the Linux kernel once the profile is collected. There's no need for a distributed build system to take advantage of that. Overall, we have improved both processing time and memory consumption over the years.
- rasz 2y agoIsnt what BOLT does done _once_ before distribution?