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/> References: <bug-236233-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D236233 --- 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=3D0x870<APIC,HYPERCALL,VPINDEX,TMFREQ> PM Features=3D0x0 [C0] Features3=3D0x0 XEN: Hypervisor version 4.7 detected. CPU: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz (2593.81-MHz K8-class CPU) Origin=3D"GenuineIntel" Id=3D0x206d6 Family=3D0x6 Model=3D0x2d Steppi= ng=3D6 =20 Features=3D0x17c3fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,= MCA,CMOV,PAT,PSE36,ACPI,MMX,FXSR,SSE,SSE2,HTT> Features2=3D0x80b82201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,x2APIC,POPCNT,HV> AMD Features=3D0x28100800<SYSCALL,NX,RDTSCP,LM> AMD Features2=3D0x1<LAHF> Hypervisor: Origin =3D "Microsoft Hv" real memory =3D 118107406336 (112636 MB) avail memory =3D 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. --=20 You are receiving this mail because: You are the assignee for the bug.=
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