== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:31:59 (1781047919)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.98507 s, 106 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: 3.72731
Iter 1/10: OSS cache speed: 4.16502
Iter 1/10: ladvise speed: 4.32744
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.22983
Iter 2/10: OSS cache speed: 5.38192
Iter 2/10: ladvise speed: 5.13004
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.44577
Iter 3/10: OSS cache speed: 5.07234
Iter 3/10: ladvise speed: 4.86179
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.71479
Iter 4/10: OSS cache speed: 5.63072
Iter 4/10: ladvise speed: 5.77084
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.14113
Iter 5/10: OSS cache speed: 5.83236
Iter 5/10: ladvise speed: 5.99138
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.04198
Iter 6/10: OSS cache speed: 6.03883
Iter 6/10: ladvise speed: 6.42414
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.83515
Iter 7/10: OSS cache speed: 5.91461
Iter 7/10: ladvise speed: 5.74983
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.40054
Iter 8/10: OSS cache speed: 6.16337
Iter 8/10: ladvise speed: 6.23939
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.52341
Iter 9/10: OSS cache speed: 6.20413
Iter 9/10: ladvise speed: 6.12631
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.13935
Iter 10/10: OSS cache speed: 6.36896
Iter 10/10: ladvise speed: 6.06145
Average uncached read: 4.81
Average speedup with OSS cached read:  5.67 = +17.87%
Average speedup with ladvise willread:  5.66 = +17.67%
Speedup with OSS cached read less than 20%,  got 5.67%. Skipping ladvise willread check.