== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:53:33 (1721408013)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.981721 s, 107 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: 2.15459
Iter 1/10: OSS cache speed: 2.41494
Iter 1/10: ladvise speed: 2.84977
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.34659
Iter 2/10: OSS cache speed: 6.3408
Iter 2/10: ladvise speed: 2.69551
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.88129
Iter 3/10: OSS cache speed: 2.61415
Iter 3/10: ladvise speed: 3.18698
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.40759
Iter 4/10: OSS cache speed: 3.79216
Iter 4/10: ladvise speed: 2.3617
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.99516
Iter 5/10: OSS cache speed: 2.68835
Iter 5/10: ladvise speed: 3.05357
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.14743
Iter 6/10: OSS cache speed: 2.21198
Iter 6/10: ladvise speed: 2.45131
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.43413
Iter 7/10: OSS cache speed: 6.57882
Iter 7/10: ladvise speed: 6.52523
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.76731
Iter 8/10: OSS cache speed: 5.66731
Iter 8/10: ladvise speed: 5.22838
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.34531
Iter 9/10: OSS cache speed: 5.24988
Iter 9/10: ladvise speed: 6.37718
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.49697
Iter 10/10: OSS cache speed: 6.13486
Iter 10/10: ladvise speed: 5.11089
Average uncached read: 3.19
Average speedup with OSS cached read:  4.36 = +36.67%
Average speedup with ladvise willread:  3.98 = +24.76%
Speedup with OSS cached read less than 20%,  got 4.36%. Skipping ladvise willread check.