== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:57:56 (1767841076)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.83522 s, 126 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.951
Iter 1/10: OSS cache speed: 2.02298
Iter 1/10: ladvise speed: 3.38389
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.31488
Iter 2/10: OSS cache speed: 3.29391
Iter 2/10: ladvise speed: 4.29719
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.87564
Iter 3/10: OSS cache speed: 4.68324
Iter 3/10: ladvise speed: 4.099
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.16977
Iter 4/10: OSS cache speed: 4.13092
Iter 4/10: ladvise speed: 4.17459
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.1095
Iter 5/10: OSS cache speed: 1.42997
Iter 5/10: ladvise speed: 2.35766
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.90667
Iter 6/10: OSS cache speed: 2.17409
Iter 6/10: ladvise speed: 2.23818
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.11852
Iter 7/10: OSS cache speed: 2.31149
Iter 7/10: ladvise speed: 2.26925
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.92004
Iter 8/10: OSS cache speed: 3.04247
Iter 8/10: ladvise speed: 3.30779
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.49341
Iter 9/10: OSS cache speed: 2.97272
Iter 9/10: ladvise speed: 2.60288
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.6603
Iter 10/10: OSS cache speed: 3.1709
Iter 10/10: ladvise speed: 3.66214
Average uncached read: 3.35
Average speedup with OSS cached read:  2.92 = +-12.83%
Average speedup with ladvise willread:  3.23 = +-3.58%
Speedup with OSS cached read less than 20%,  got 2.92%. Skipping ladvise willread check.