Claude
f8c9e244a3
Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b3pDoGLiWk6LLBeHjW
23 lines
1.3 KiB
Plaintext
23 lines
1.3 KiB
Plaintext
$ java -Xmx64m LineCount reader big.log
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reader lines=9,623,347 chars=990,376,717 time=1,288 ms gc=37 collections / 31 ms (-Xmx64 MB)
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$ java -Xmx64m LineCount scanner big.log
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scanner lines=9,623,347 chars=990,376,717 time=6,233 ms gc=140 collections / 116 ms (-Xmx64 MB)
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$ java -Xmx64m LineCount lines big.log
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lines lines=9,623,347 chars=990,376,717 time=1,179 ms gc=37 collections / 32 ms (-Xmx64 MB)
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$ java -Xmx64m LineCount readAllLines big.log
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readAllLines OutOfMemoryError: Java heap space (-Xmx64 MB)
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How much heap does readAllLines need for this file?
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$ java -Xmx1g LineCount readAllLines big.log
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readAllLines OutOfMemoryError: Java heap space (-Xmx1024 MB)
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$ java -Xmx2g LineCount readAllLines big.log
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readAllLines lines=9,623,347 chars=990,376,717 time=2,872 ms gc=24 collections / 922 ms (-Xmx2048 MB)
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$ java -Xmx3g LineCount readAllLines big.log
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readAllLines lines=9,623,347 chars=990,376,717 time=2,729 ms gc=23 collections / 949 ms (-Xmx3072 MB)
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$ java -Xmx4g LineCount readAllLines big.log
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readAllLines lines=9,623,347 chars=990,376,717 time=2,862 ms gc=23 collections / 905 ms (-Xmx4096 MB)
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And the streaming reader at a tiny heap:
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$ java -Xmx16m LineCount reader big.log
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reader lines=9,623,347 chars=990,376,717 time=1,347 ms gc=171 collections / 101 ms (-Xmx16 MB)
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