== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:10:04 (1747401004)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.524597 s, 200 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: 4.61843
Iter 1/10: OSS cache speed: 5.03965
Iter 1/10: ladvise speed: 4.89512
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.44891
Iter 2/10: OSS cache speed: 4.44963
Iter 2/10: ladvise speed: 5.02549
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.38802
Iter 3/10: OSS cache speed: 4.38205
Iter 3/10: ladvise speed: 5.00783
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.14509
Iter 4/10: OSS cache speed: 5.03904
Iter 4/10: ladvise speed: 4.88233
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.76494
Iter 5/10: OSS cache speed: 5.03992
Iter 5/10: ladvise speed: 4.74249
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.41152
Iter 6/10: OSS cache speed: 4.72753
Iter 6/10: ladvise speed: 4.32568
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.84124
Iter 7/10: OSS cache speed: 5.22543
Iter 7/10: ladvise speed: 4.84646
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.67909
Iter 8/10: OSS cache speed: 4.60462
Iter 8/10: ladvise speed: 5.1027
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.83395
Iter 9/10: OSS cache speed: 4.53654
Iter 9/10: ladvise speed: 5.13836
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.09088
Iter 10/10: OSS cache speed: 5.14259
Iter 10/10: ladvise speed: 4.8997
Average uncached read: 4.82
Average speedup with OSS cached read:  4.81 = +-.20%
Average speedup with ladvise willread:  4.88 = +1.24%
Speedup with OSS cached read less than 20%,  got 4.81%. Skipping ladvise willread check.