Date: Wed, 06 Mar 2019 14:35:31 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 236233] Python multiprocessing is 4x slower with 11.2 compared to 11.0 kernel Message-ID: <bug-236233-227-4lwloWMbyH@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-236233-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236233 --- Comment #4 from Alex Richardson <arichardson@FreeBSD.org> --- It is a virtual machine with an Intel CPU: CPU info from dmesg: Hyper-V Version: 0.0.0 [SP0] Features=0x870<APIC,HYPERCALL,VPINDEX,TMFREQ> PM Features=0x0 [C0] Features3=0x0 XEN: Hypervisor version 4.7 detected. CPU: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz (2593.81-MHz K8-class CPU) Origin="GenuineIntel" Id=0x206d6 Family=0x6 Model=0x2d Stepping=6 Features=0x17c3fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,ACPI,MMX,FXSR,SSE,SSE2,HTT> Features2=0x80b82201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,x2APIC,POPCNT,HV> AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM> AMD Features2=0x1<LAHF> Hypervisor: Origin = "Microsoft Hv" real memory = 118107406336 (112636 MB) avail memory = 114828369920 (109508 MB) Event timer "LAPIC" quality 100 ACPI APIC Table: <Xen HVM> FreeBSD/SMP: Multiprocessor System Detected: 32 CPUs FreeBSD/SMP: 2 package(s) x 16 core(s) It is kind of difficult to see which sycalls take longer before and after but my guess is that it is related to semaphores since it is attempting to get data from the subprocesses and it uses semaphores for synchronization. I'm not sure if there is an easy way to see what is taking longer. I'll see if I can somehow get the information using DTrace. -- You are receiving this mail because: You are the assignee for the bug.help
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