Feature/improve adapter perf fix server oom #5547
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- String.format is lower than StringBuilder. Benchmark like below:
code snippet:
String str = String.format("%s-%s-%s", 0, 1, 10);
Benchmark Mode Cnt Score Error Units
StringBenchmark.append thrpt 46431458.255 ops/s
StringBenchmark.format thrpt 985724.313 ops/s
StringBenchmark.append avgt ≈ 10⁻⁸ s/op
StringBenchmark.format avgt ≈ 10⁻⁶ s/op
StringBenchmark.append sample 364232 ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.00 sample ≈ 10⁻⁸ s/op
StringBenchmark.append:p0.50 sample ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.90 sample ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.95 sample ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.99 sample ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.999 sample ≈ 10⁻⁷ s/op
StringBenchmark.append:p0.9999 sample ≈ 10⁻⁵ s/op
StringBenchmark.append:p1.00 sample 0.001 s/op
StringBenchmark.format sample 336220 ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.00 sample ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.50 sample ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.90 sample ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.95 sample ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.99 sample ≈ 10⁻⁶ s/op
StringBenchmark.format:p0.999 sample ≈ 10⁻⁵ s/op
StringBenchmark.format:p0.9999 sample ≈ 10⁻⁴ s/op
StringBenchmark.format:p1.00 sample 0.001 s/op
StringBenchmark.append ss ≈ 10⁻⁶ s/op
StringBenchmark.format ss ≈ 10⁻⁵ s/op
- FastJSON2 内存保护机制，默认64MB，超过则抛出OutOfMemory异常
- 见：JSONWriter.ensureCapacity
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String.format 性能太差