Stop using precompiled headers for Linux? (original) (raw)

Aleksey Shipilev shade at redhat.com
Fri Nov 2 16:33:30 UTC 2018

On 11/02/2018 12:14 PM, Magnus Ihse Bursie wrote:

And here is the "winning" list (which I declared as "on or above 130, without inline"). I encourage everyone to try this on their own system, and report back the results!

#ifndef DONTUSEPRECOMPILEDHEADER # include "classfile/classLoaderData.hpp" # include "classfile/javaClasses.hpp" # include "classfile/systemDictionary.hpp" # include "gc/shared/collectedHeap.hpp" # include "gc/shared/gcCause.hpp" # include "logging/log.hpp" # include "memory/allocation.hpp" # include "memory/iterator.hpp" # include "memory/memRegion.hpp" # include "memory/resourceArea.hpp" # include "memory/universe.hpp" # include "oops/instanceKlass.hpp" # include "oops/klass.hpp" # include "oops/method.hpp" # include "oops/objArrayKlass.hpp" # include "oops/objArrayOop.hpp" # include "oops/oop.hpp" # include "oops/oopsHierarchy.hpp" # include "runtime/atomic.hpp" # include "runtime/globals.hpp" # include "runtime/handles.hpp" # include "runtime/mutex.hpp" # include "runtime/orderAccess.hpp" # include "runtime/os.hpp" # include "runtime/thread.hpp" # include "runtime/timer.hpp" # include "services/memTracker.hpp" # include "utilities/align.hpp" # include "utilities/bitMap.hpp" # include "utilities/copy.hpp" # include "utilities/debug.hpp" # include "utilities/exceptions.hpp" # include "utilities/globalDefinitions.hpp" # include "utilities/growableArray.hpp" # include "utilities/macros.hpp" # include "utilities/ostream.hpp" # include "utilities/ticks.hpp" #endif // !DONTUSEPRECOMPILEDHEADER

"make clean hotspot" times on my TR 2950X Linux x86_64 build node:

no PCH: {134s, 135s, 135s} wall, ~59m user old PCH: {136s, 136s, 135s} wall, ~55m user new PCH: {111s, 108s, 108s} wall, ~45m user

I am all for shallower PCH, even knowing I would disable it for my builds anyway :)

Thanks, -Aleksey

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