JDK-8378076 apparently pulverizes Hotspot build performance at least with GCC 13.3.0. This is a major productivity loss.

using configure arguments '--with-boot-jdk=/home/shade/Install/jdk25u-ea --with-debug-level=fastdebug --with-jtreg=/home/shade/Install/jtreg-8.2.1+1 --with-gtest=/home/shade/Install/googletest-1.14.0/ --disable-precompiled-headers'.

Configuration summary:
* Name: linux-x86_64-server-fastdebug
* Debug level: fastdebug
* HS debug level: fastdebug
* JVM variants: server
* JVM features: server: 'cds compiler1 compiler2 epsilongc g1gc jfr jni-check jvmci jvmti management parallelgc serialgc services shenandoahgc vm-structs zgc'
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
* Version string: 27-internal-adhoc.shade.jdk (27-internal)
* Source date: 1771425864 (2026-02-18T14:44:24Z)

Tools summary:
* Boot JDK: openjdk version "25.0.3-testing" 2026-04-21 OpenJDK Runtime Environment (build 25.0.3-testing-builds.shipilev.net-openjdk-jdk25-b156-20251204-0942) OpenJDK 64-Bit Server VM (build 25.0.3-testing-builds.shipilev.net-openjdk-jdk25-b156-20251204-0942, mixed mode, sharing) (at /home/shade/Install/jdk25u-ea)
* Toolchain: gcc (GNU Compiler Collection)
* C Compiler: Version 13.3.0 (at /usr/bin/gcc)
* C++ Compiler: Version 13.3.0 (at /usr/bin/g++)

Build performance summary:
* Build jobs: 32
* Memory limit: 128708 MB


$ time LOG=info CONF=linux-x86_64-server-fastdebug make clean hotspot | ts -s

# mainline at a86a847f57a2244b670a6532399278dd550c4e2f~1:

00:02:51 ----- Build times -------
00:02:51 Start 2026-02-18 17:29:19
00:02:51 End 2026-02-18 17:32:09
00:02:51
00:02:51 00:02:50 TOTAL
00:02:51 -------------------------
00:02:51 Finished building targets 'clean hotspot' in configuration 'linux-x86_64-server-fastdebug'

real 2m50.709s
user 75m39.196s
sys 7m34.995s

# mainline at a86a847f57a2244b670a6532399278dd550c4e2f:

00:06:58 ----- Build times -------
00:06:58 Start 2026-02-18 17:32:28
00:06:58 End 2026-02-18 17:39:25
00:06:58
00:06:58 00:06:57 TOTAL
00:06:58 -------------------------
00:06:58 Finished building targets 'clean hotspot' in configuration 'linux-x86_64-server-fastdebug'

real 6m58.094s
user 167m35.701s
sys 8m58.363s