== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:28:48 (1748982528)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.509159 s, 206 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: 5.26406
Iter 1/10: OSS cache speed: 5.35581
Iter 1/10: ladvise speed: 3.85903
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.29248
Iter 2/10: OSS cache speed: 3.96089
Iter 2/10: ladvise speed: 3.54579
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.22051
Iter 3/10: OSS cache speed: 5.9696
Iter 3/10: ladvise speed: 5.10608
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.67792
Iter 4/10: OSS cache speed: 4.46612
Iter 4/10: ladvise speed: 4.50649
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.87546
Iter 5/10: OSS cache speed: 6.14765
Iter 5/10: ladvise speed: 6.38425
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.95508
Iter 6/10: OSS cache speed: 5.30267
Iter 6/10: ladvise speed: 4.74286
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.1845
Iter 7/10: OSS cache speed: 3.59691
Iter 7/10: ladvise speed: 4.13829
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.63418
Iter 8/10: OSS cache speed: 6.15072
Iter 8/10: ladvise speed: 5.53242
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.61759
Iter 9/10: OSS cache speed: 6.0413
Iter 9/10: ladvise speed: 5.44214
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.27618
Iter 10/10: OSS cache speed: 6.20586
Iter 10/10: ladvise speed: 5.76934
Average uncached read: 4.69
Average speedup with OSS cached read:  5.31 = +13.21%
Average speedup with ladvise willread:  4.90 = +4.47%
Speedup with OSS cached read less than 20%,  got 5.31%. Skipping ladvise willread check.