From b204fcdb07c2498e349eab6f93e3ecdfa9f8589c Mon Sep 17 00:00:00 2001 From: Martin Schiller Date: Mon, 7 Oct 2019 06:52:08 +0200 Subject: [PATCH] target/imagebuilder: use multi-thread support for xz compression MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This speeds up the packing of the imagebuilder a lot: imagebuilder-T0.tar.xz real 0m25.199s user 2m45.967s sys 0m1.218s imagebuilder-T1.tar.xz real 2m02.543s user 2m02.418s sys 0m1.653s imagebuilder-T2.tar.xz real 1m03.684s user 1m59.931s sys 0m0.587s imagebuilder-T3.tar.xz real 0m48.033s user 2m02.904s sys 0m0.637s imagebuilder-T4.tar.xz real 0m38.963s user 2m15.521s sys 0m0.783s imagebuilder-T5.tar.xz real 0m37.994s user 2m21.461s sys 0m0.919s imagebuilder-T6.tar.xz real 0m39.524s user 2m48.115s sys 0m1.279s imagebuilder-T7.tar.xz real 0m34.061s user 2m45.097s sys 0m1.174s imagebuilder-T8.tar.xz real 0m27.286s user 2m55.449s sys 0m1.329s imagebuilder-T9.tar.xz real 0m25.205s user 2m44.894s sys 0m1.208s To keep the output reproducible in any case, we enforce a minimum amount of 2 threads. Signed-off-by: Martin Schiller [refactored into reusable NPROC var, more verbose commit message] Signed-off-by: Petr Štetiar --- rules.mk | 1 + target/imagebuilder/Makefile | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/rules.mk b/rules.mk index b140fbca70..f1ca735f2e 100644 --- a/rules.mk +++ b/rules.mk @@ -70,6 +70,7 @@ TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX)) BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX)) SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR}) BUILD_SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR}) +NPROC:=$(shell sysctl -n hw.ncpu 2>/dev/null || nproc) export SHELL:=/usr/bin/env bash IS_PACKAGE_BUILD := $(if $(filter package/%,$(BUILD_SUBDIR)),1) diff --git a/target/imagebuilder/Makefile b/target/imagebuilder/Makefile index 05c7cf3318..b463feb456 100644 --- a/target/imagebuilder/Makefile +++ b/target/imagebuilder/Makefile @@ -86,7 +86,7 @@ endif (cd $(PKG_BUILD_DIR); find staging_dir/host/bin/ $(IB_LDIR)/scripts/dtc/ -type f | \ $(XARGS) $(SCRIPT_DIR)/bundle-libraries.sh $(PKG_BUILD_DIR)/staging_dir/host) STRIP=sstrip $(SCRIPT_DIR)/rstrip.sh $(PKG_BUILD_DIR)/staging_dir/host/bin/ - $(TAR) -cf - -C $(BUILD_DIR) $(IB_NAME) | xz -zc -7e > $@ + $(TAR) -cf - -C $(BUILD_DIR) $(IB_NAME) | xz -T$(if $(filter 1,$(NPROC)),2,0) -zc -7e > $@ download: prepare: