Arvados

Here's the Go code that calculates the actual RAM request.

So we want to subtract all the overhead from the topline instance RAM to get the maximum value of "RuntimeConstraints.RAM" that the user can provide to get this instance type.

    needRAM := ctr.RuntimeConstraints.RAM + ctr.RuntimeConstraints.KeepCacheRAM
    needRAM += int64(cc.Containers.ReserveExtraRAM)
    if cc.Containers.LocalKeepBlobBuffersPerVCPU > 0 {
        // + 200 MiB for keepstore process + 10% for GOGC=10
        needRAM += 220 << 20
        // + 64 MiB for each blob buffer + 10% for GOGC=10
        needRAM += int64(cc.Containers.LocalKeepBlobBuffersPerVCPU * needVCPUs * (1 << 26) * 11 / 10)
    }
    needRAM = (needRAM * 100) / int64(100-discountConfiguredRAMPercent)

Peter Amstutz wrote in #note-24:

Here's the Go code that calculates the actual RAM request.

#20801 is tangentially related. If this ticket happens first, sure, fine, but then if we ever want to do #20801, it should probably grow to include undoing the math in Workbench 2 as well.