Thanks David, I just found the reference you mention, it is a little vague, but says maybe as you said. I've reworked and tested the following which seems better: NUM_CORES=`lparstat -m | grep -o "lcpu=[[0-9]]*" | cut -d "=" -f 2` I'll create a new webrev with this. Thanks Andrew
Andrew Leonard Java Runtimes Development IBM Hursley IBM United Kingdom Ltd Phone internal: 245913, external: 01962 815913 internet email: andrew_m_leon...@uk.ibm.com From: David Holmes <david.hol...@oracle.com> To: Erik Joelsson <erik.joels...@oracle.com>, Andrew Leonard <andrew_m_leon...@uk.ibm.com>, build-dev@openjdk.java.net Date: 30/01/2019 02:25 Subject: Re: Proposal: JDK-8217896: Make better use of LCPUs when building on AIX On 30/01/2019 3:05 am, Erik Joelsson wrote: > Hello, > > I'm OK with this, but since I can't verify it at all, I would be more > comfortable if one of the other AIX users would review this as well. Ditto. I did some googling on this and pmcycles is flagged as maybe being deprecated in the future and may require privileges to execute. lparstat -i seems to be more commonly used. David ----- > /Erik > > On 2019-01-29 05:08, Andrew Leonard wrote: >> Hi, >> Please can I get a sponsor for this build performance enhancement on AIX, >> by better determining the number of LCPUs on smt AIX machines: >> https://urldefense.proofpoint.com/v2/url?u=https-3A__cr.openjdk.java.net_-7Ealeonard_8217896_webrev.00_&d=DwIDaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=NaV8Iy8Ld-vjpXZFDdTbgGlRTghGHnwM75wUPd5_NUQ&m=FpNeQfFJBut0AAVlbC0w7o0urDCArfDb4PY1TtMVW4I&s=8vmPiiNU5P6MnXKdE-eyyBm48kgCssjH5VyWHAt5zcM&e= >> My testing shows up to 30% improved build times when leveraging the >> available LCPUs. >> Many thanks >> Andrew >> >> Andrew Leonard >> Java Runtimes Development >> IBM Hursley >> IBM United Kingdom Ltd >> Phone internal: 245913, external: 01962 815913 >> internet email: andrew_m_leon...@uk.ibm.com >> >> >> Unless stated otherwise above: >> IBM United Kingdom Limited - Registered in England and Wales with number >> 741598. >> Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 >> 3AU Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
