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50 lines
2.0 KiB
Bash
50 lines
2.0 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2019-02-01 16:54:55 +0000 (Fri, 01 Feb 2019)
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#
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# https://github.com/HariSekhon/DevOps-Bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/HariSekhon
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#
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# Calculates the total combined RAM in MB allocated to all Java heap sizes on all JVM processes running on the local machine
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#
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# Requires recent version of GNU coreutils to be installed for correct MB conversions (you might need to 'brew upgrade coreutils' on Mac)
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#
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# You should account for at least ~20% overhead on top of this to account for non-heap Java RAM usage eg. off-heap allocations, JIT optimizations, JNI code, GC (especially G1) etc...
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#
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# Sun JDK 8, OpenJDK 11 and IBM JDK all treat the last -Xmx on the command line as the actual one, so we are going with that
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#
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# You can check this is true on your specific implementation like so:
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#
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# java -version; java -Xmx1G -XX:+PrintFlagsFinal -Xmx2G 2>/dev/null | grep MaxHeapSize
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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if [ "$(uname -s)" = Darwin ]; then
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# numfmt seems to only work on capitalized unit suffixes
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numfmt(){ gnumfmt "$@"; }
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fi
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# picks up other things like Adobe crash reporter with lots of java related env vars - which is wrong, we only care about CLI args to java procs
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# shellcheck disable=SC2009
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#pgrep -l -f java |
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ps -ef |
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grep java |
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grep -v -e '[[:space:][:alpha:]]grep[[:space:]]' -e 'sed[[:space:]]' |
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sed 's/.*[[:space:]]-Xmx/-Xmx/' |
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grep --color=no -o -- '-Xmx[^[:space:]]*' |
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sed 's/-Xmx//' |
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numfmt --from=iec |
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awk '{sum += $1} END {print sum}' |
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numfmt --to-unit=Mi # newers versions (eg. 8.30) need Mi for correct unit conversion,
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# but older versions (eg. 8.23) crash when given Mi as target unit
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# eg. 'Abort trap: 6' - if this happens to you, 'brew upgrade coreutils' to resolve it
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