bool(true)
bool(true)
array(2) {
  ["instructions"]=>
  ["cpu-cycles"]=>
}
array(2) {
  ["instructions"]=>
  ["cache-references"]=>
}
array(2) {
  ["instructions"]=>
  ["cache-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["branches"]=>
}
array(2) {
  ["instructions"]=>
  ["branch-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["bus-cycles"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-load-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-stores"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-store-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-prefetches"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-dcache-prefetch-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-icache-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["L1-icache-load-misses"]=>
}
failed to set perf event: L1-icache-prefetches
array(1) {
  ["instructions"]=>
}
failed to set perf event: L1-icache-prefetch-misses
array(1) {
  ["instructions"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-load-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-stores"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-store-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-prefetches"]=>
}
array(2) {
  ["instructions"]=>
  ["LLC-prefetch-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["dTLB-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["dTLB-load-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["dTLB-stores"]=>
}
array(2) {
  ["instructions"]=>
  ["dTLB-store-misses"]=>
}
failed to set perf event: dTLB-prefetches
array(1) {
  ["instructions"]=>
}
failed to set perf event: dTLB-prefetch-misses
array(1) {
  ["instructions"]=>
}
array(2) {
  ["instructions"]=>
  ["iTLB-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["iTLB-load-misses"]=>
}
array(2) {
  ["instructions"]=>
  ["branch-loads"]=>
}
array(2) {
  ["instructions"]=>
  ["branch-load-misses"]=>
}