I’m trying to understand how Julia allocates memory. I ran into some trouble when I tried to run multiple threads with the below code because memory wasn’t being cleared. struct Container field::Vector{Matrix{Float64}} end function f!(x::Container) push!(x.field, randn(10, 10000)) end funct…

What part of RSS is used by the Julia process? It may very well be that Julia has actually freed the memory, but the OS hasn’t yet taken it back, so to speak. Of course, it’s also possible that Julia holds onto the memory for a bit - it’s likely that you’re going to allocate more objects of that siz…

ccall(:malloc_trim, Int32, (Int32,), 0) can get Julia to release more memory to the OS

This works. What exactly is going on here?

[image] Jad_Zeitouni: What exactly is going on here? As I said, the GC may have already called free. malloc_trim explicitly asks the underlying malloc to reclaim the memory that free has been called on, but not yet given up for new allocations. See also malloc_trim(3) - Linux manual page . Th…

Thank you. I apologize I was just not familiar with what a resident set size is :laughing: Is there any way to report a more accurate measure of used memory instead of having to call malloc_trim?

It’s unfortunately a bit difficult to estimate that; from Julias POV, it already freed the memory. From the OS POV, Julia is still “using” that memory, because it hasn’t yet checked whether it actually does. If you want to know how much memory is currently used from Julias’ POV, I’m not aware of an…

Memory Management

New to Julia

xgdgsc August 8, 2023, 3:01am 4

Which version? It could be the bug before 1.10 like The improvement of memory management in multihtreading Julia 1.10beta is amazing!

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Memory Management

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