gsmiller commented on a change in pull request #69:
URL: https://github.com/apache/lucene/pull/69#discussion_r609667950
##########
File path: lucene/core/src/java/org/apache/lucene/codecs/lucene90/PForUtil.java
##########
@@ -121,4 +167,146 @@ void skip(DataInput in) throws IOException {
in.skipBytes(forUtil.numBytes(bitsPerValue) + (numExceptions << 1));
}
}
+
+ /**
+ * Fill {@code longs} with the final values for the case of all deltas being
1. Note this assumes
+ * there are no exceptions to apply.
+ */
+ private static void prefixSumOfOnes(long[] longs, long base) {
+ System.arraycopy(IDENTITY_PLUS_ONE, 0, longs, 0, ForUtil.BLOCK_SIZE);
+ // This loop gets auto-vectorized
+ for (int i = 0; i < ForUtil.BLOCK_SIZE; ++i) {
+ longs[i] += base;
+ }
+ }
+
+ /**
+ * Fill {@code longs} with the final values for the case of all deltas being
{@code val}. Note
+ * this assumes there are no exceptions to apply.
+ */
+ private static void prefixSumOf(long[] longs, long base, long val) {
+ for (int i = 0; i < ForUtil.BLOCK_SIZE; i++) {
+ longs[i] = (i + 1) * val + base;
Review comment:
@rmuir instance type swap did the trick. Thanks so much! Grabbing your
command from above, here's the suspicious difference (in case this helps in the
future):
* instance type: m4.10xlarge
```
m4.10xl% sudo journalctl -k | grep PMU
Mar 24 15:02:23 localhost kernel: Performance Events: unsupported p6 CPU
model 63 no PMU driver, software events only.
Mar 24 15:02:23 localhost kernel: RAPL PMU: API unit is 2^-32 Joules, 0
fixed counters, 655360 ms ovfl timer
```
* instance type: m5.12xlarge
```
m5.12xl% sudo journalctl -k | grep PMU
Apr 08 04:02:43 localhost kernel: Performance Events: Skylake events, Intel
PMU driver.
Apr 08 04:02:43 localhost kernel: RAPL PMU: API unit is 2^-32 Joules, 0
fixed counters, 10737418240 ms ovfl timer
```
I've confirmed `perfasm` is working for me. I'll get some results updated
here shortly. Thanks again!
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