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carl-mastrangelo / out.c
Created July 1, 2020 07:23
#include <x86intrin.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <inttypes.h>
static __inline__ uint64_t rdtsc(void){
uint32_t hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ( (uint64_t)lo)|( ((uint64_t)hi)<<32 );
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carl-mastrangelo / Project Panama.md
Last active May 31, 2020 21:36
Project Panama 
#include <stdlib.h>

void * jmalloc(size_t size) {
  return malloc(size);
}

void jfree(void * ptr) {
  free(ptr);
}
@carl-mastrangelo
carl-mastrangelo / gist:2109879dc30cc161faba0892d660c183
Last active July 3, 2019 05:53
Before
---------------------------------------------------------------------------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------------------------------------------------------------------------
BM_HpackEncoderInitDestroy 198 ns 198 ns 3535074
BM_HpackEncoderEncodeDeadline 129 ns 129 ns 5219422 framing_bytes/iter:9 header_bytes/iter:6
BM_HpackEncoderEncodeHeader<EmptyBatch>/0/16384 31 ns 31 ns 22189800 framing_bytes/iter:9 header_bytes/iter:0
BM_HpackEncoderEncodeHeader<EmptyBatch>/1/16384 31 ns 31 ns 22162902 framing_bytes/iter:9 header_bytes/iter:0
BM_HpackEncoderEncodeHeader
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carl-mastrangelo / Graal openjdk13-ea+22.md
Created May 27, 2019 19:42 
# JMH version: 1.21
# VM version: JDK 13-ea, OpenJDK 64-Bit Server VM, 13-ea+22
# VM invoker: /home/carl/Downloads/jdk-13/bin/java
# VM options: -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+UseJVMCICompiler -XX:+LogCompilation -XX:LogFile=/tmp/blah.txt -XX:+PrintAssembly -XX:+PrintInterpreter -XX:+PrintNMethods -XX:+PrintNativeNMethods -XX:+PrintSignatureHandlers -XX:+PrintAdapterHandlers -XX:+PrintStubCode -XX:+PrintCompilation -XX:+PrintInlining -XX:+TraceClassLoading -XX:PrintAssemblyOptions=syntax -XX:PrintAssemblyOptions=intel
# Warmup: 10 iterations, 10 s each
# Measurement: 5 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
# Benchmark mode: Average time, time/op
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carl-mastrangelo / C2 vs Graal.md
Last active May 26, 2019 22:15
C2 vs Graal

C2:

# JMH version: 1.21
# VM version: JDK 11.0.2, Java HotSpot(TM) 64-Bit Server VM, 11.0.2+9-LTS
# VM invoker: /home/carl/bin/jdk-11.0.2/bin/java
# VM options: -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+LogCompilation -XX:LogFile=/tmp/blah.txt -XX:+PrintAssembly -XX:+PrintInterpreter -XX:+PrintNMethods -XX:+PrintNativeNMethods -XX:+PrintSignatureHandlers -XX:+PrintAdapterHandlers -XX:+PrintStubCode -XX:+PrintCompilation -XX:+PrintInlining -XX:+TraceClassLoading -XX:PrintAssemblyOptions=syntax -XX:PrintAssemblyOptions=intel
# Warmup: 10 iterations, 1 s each
# Measurement: 5 iterations, 1 s each
# Timeout: 10 min per iteration
# Threads: 1 thread, will synchronize iterations
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carl-mastrangelo / Test.java
Last active May 12, 2019 08:27
Lossy SPSC Ring Buffer
package test;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.concurrent.atomic.AtomicLong;
import org.openjdk.jcstress.annotations.Actor;
import org.openjdk.jcstress.annotations.Expect;
import org.openjdk.jcstress.annotations.JCStressTest;
import org.openjdk.jcstress.annotations.Outcome;
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carl-mastrangelo / DelayedClientCall.java
Last active August 9, 2018 00:19
public class DelayedForwardingClientCall<ReqT, RespT>
extends ForwardingClientCall<ReqT, RespT>{
private final ClientCall<ReqT, RespT> delegate;
private final Queue<Runnable> calls = new ArrayDeque<Runnable>();
private boolean started;
protected DelayedForwardingClientCall(ClientCall<ReqT, RespT> delegate) {
this.delegate = delegate;
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carl-mastrangelo / Convert from ~PEM key to Java's PEM in PKCS8
Created February 7, 2018 20:14
openssl pkcs8 -inform PEM -nocrypt -topk8 -in $INFILE -outform PEM -out $OUTFILE
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carl-mastrangelo / gist:8e0c64e8b4588669857808f37aebcdac
Last active January 27, 2023 21:25
Golang hash function
// https://play.golang.org/p/auAxrJQ1b1
package main
import (
"fmt"
"reflect"
"unsafe"
)
type rtype struct {
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carl-mastrangelo / gist:5f120d91a1a50844cb9582f8eb8aec67
Last active September 23, 2017 00:17
Atomic Costs
/*
Benchmark Mode Cnt Score Error Units
AtomicBenchmark.compareAndSet sample 1665797 493.817 卤 2.426 ns/op
AtomicBenchmark.compareAndSet:compareAndSet路p0.00 sample 25.000 ns/op
AtomicBenchmark.compareAndSet:compareAndSet路p0.50 sample 274.000 ns/op
AtomicBenchmark.compareAndSet:compareAndSet路p0.90 sample 950.000 ns/op
AtomicBenchmark.compareAndSet:compareAndSet路p0.95 sample 1606.000 ns/op
AtomicBenchmark.compareAndSet:compareAndSet路p0.99 sample 3760.000 ns/op