== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:29:57 (1759843797)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.632364 s, 166 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: 4.22548
Iter 1/10: OSS cache speed: 4.13967
Iter 1/10: ladvise speed: 4.20379
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.989
Iter 2/10: OSS cache speed: 4.25571
Iter 2/10: ladvise speed: 4.10322
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.19476
Iter 3/10: OSS cache speed: 3.96821
Iter 3/10: ladvise speed: 3.40591
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.62861
Iter 4/10: OSS cache speed: 4.27982
Iter 4/10: ladvise speed: 4.34819
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.32226
Iter 5/10: OSS cache speed: 4.36358
Iter 5/10: ladvise speed: 3.58371
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.31444
Iter 6/10: OSS cache speed: 4.3405
Iter 6/10: ladvise speed: 4.15803
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.14907
Iter 7/10: OSS cache speed: 3.98229
Iter 7/10: ladvise speed: 3.42095
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.09733
Iter 8/10: OSS cache speed: 3.32138
Iter 8/10: ladvise speed: 3.85413
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.2039
Iter 9/10: OSS cache speed: 4.14719
Iter 9/10: ladvise speed: 4.41086
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.23319
Iter 10/10: OSS cache speed: 3.86136
Iter 10/10: ladvise speed: 4.21612
Average uncached read: 3.93
Average speedup with OSS cached read:  4.06 = +3.30%
Average speedup with ladvise willread:  3.97 = +1.01%
Speedup with OSS cached read less than 20%,  got 4.06%. Skipping ladvise willread check.