Claude
1d0cd8b36e
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
31 lines
1.4 KiB
Bash
Executable File
31 lines
1.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Runs each approach against the huge file under a ladder of -Xmx limits, one fresh JVM per run.
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# Streaming modes run every rung (to show memory stays flat). Tree/bind climb until the first
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# rung that succeeds, then stop. Output: output/bench.txt (timings vary run to run)
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set -u
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cd "$(dirname "$0")/.."
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FILE="${1:-target/huge.json}"
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CP="target/classes:$(cat target/cp.txt)"
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OUT=output/bench.txt
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mkdir -p output
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{
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echo "file: $FILE ($(stat -c %s "$FILE") bytes)"
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echo "java: $(java -version 2>&1 | grep -v 'Picked up' | head -1)"
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echo "cpus: $(nproc) ram: $(free -m | awk '/Mem:/{print $2}') MB"
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echo
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for mode in stream hybrid; do
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for x in 32 64 128 1024; do
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java -Xmx${x}m -cp "$CP" com.ankurm.jackson3.streaminghuge.Scan $mode "$FILE" 2>&1 | grep -v '^Picked up'
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done
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done
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for mode in tree bind; do
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for x in 64 256 1024 2048 3072 4096 6144; do
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line=$(timeout 900 java -Xmx${x}m -cp "$CP" com.ankurm.jackson3.streaminghuge.Scan $mode "$FILE" 2>&1 | grep -v '^Picked up'; echo "exit=${PIPESTATUS[0]}")
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# no output at all = the JVM was SIGKILLed (exit 137) by the container's OOM killer
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case "$line" in exit=*) line=$(printf '%-7s -Xmx=%5d MB KILLED no Java output, %s (SIGKILL by the OS: the heap limit was larger than free RAM)' "$mode" "$x" "$line");; *) line="${line%exit=*}"; line="${line%$'\n'}";; esac
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echo "$line"
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case "$line" in *" OK "*) break;; esac
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done
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done
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} | tee "$OUT"
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