<div dir="ltr"><div><div>Hi <br><br></div>We are trying to replace glibc malloc with jemalloc because we have several concurrent allocations and in all our benchmarks jemalloc is consistently better than glibc malloc and many others. <br>
<br>Our setups start typically with 96 GB of RAM and up. We have observed that using jemalloc the virtual memory usage of our process rises up to around 75GB. While the resident memory stays low and it is not a problem as such, when we try to fork a process from within here, it fails as the kernel assumes there is not enough memory to copy the VM space. Perhaps a vfork would be better but we can't use that for now.<br>
<br>So we have made some modifications to jemalloc so that all huge memory allocations are forced to unmap their memory on freeing up. Non huge memory allocations and freeing up remain the same. This seems to help us. I have attached the patch here which is against jemalloc-3.3.1. Please review and suggest if there is a better way to handle this.<br>
<br>-- <br>Regards<br>Abhishek
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