Viewing profile — fruneau

Extensions are how new features come to an established language... C11 standard mostly standardised stuff that was already supported as extension by most compilers. Most of the tim…

Three main reasons for this. First, we originally chose the C language because it is much much simpler. One can master the language without too much pain, and you end up having muc…

Some already tried: http://anzwix.com/a/FreeBSD/GccAddSupportForApplesBlockExten... http://gcc.1065356.n5.nabble.com/RFC-Apple-Blocks-extension-... I'm not aware of any attempt tha…

Thanks. That said, I'm not sure the amount of effort is that huge: having a working rewriter was a matter of days, which makes it far less expensive than rewriting a codebase of se…

Languages such as Go, Rust or Swift aim to fill that gap, but in 2010 they were either nascent or simply inexistent.

There's a moment when you realise you should avoid allocations because you discover that allocations are expensive. Then you also realise at some point that you cannot avoid some a…

Moreover, I think that some answers are not doing what we should expect from the subject. For example the "Detect Multiple Of Two" detects powers of two, not multiples.

I do agree. That ASan part of the article starts with the following sentence: "The tradeoff however is that ASan won’t detect errors such as uses of uninitialized variables or leak…

Clearly, we go back to the initial statement: for specific use cases, we need specific allocators.

There are two main issues with alloca: first you cannot deallocate or reallocate the memory, you just append more data to your frame. As a consequence, it is not suitable for dynam…

alloca has its drawbacks. See the previous article in the series: https://techtalk.intersec.com/2013/08/memory-part-3-managing...

I admit that test stress some corner cases (at least some cases that the allocator designer consider as corner cases). That said, malloc has no choice but supporting that use case.…

The diff is a truncation. The actual error rate is 0.5ms on average. By using a round instead of truncation, we can reduce the error to 0.25ms on average.

jemalloc 3.4.0 (current package in debian sid)

PHP is used as a small layer that enables talking to our C code from javascript. We have a custom (Protocol Buffer-like) protocol to manage our RPC, the PHP embeds a native module …

These allocators are based on mmap to build the arenas.

I'll consider writing a more detailed article on the subject. Open-sourcing the code will not be possible in the short-term.

The objective of the article wasn't to stress the specific case of the 8-bytes allocation pattern, it was about showing that malloc behavior depends on the context. The size of 8 b…