== sanity test 255a: check 'lfs ladvise -a willread' ===== 12:54:35 (1721408075)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.10828 s, 94.6 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: 1.39858
Iter 1/10: OSS cache speed: 1.77565
Iter 1/10: ladvise speed: 4.93459
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.34602
Iter 2/10: OSS cache speed: 1.20545
Iter 2/10: ladvise speed: 1.64333
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.99625
Iter 3/10: OSS cache speed: 2.08405
Iter 3/10: ladvise speed: 0.987536
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.4472
Iter 4/10: OSS cache speed: 1.37792
Iter 4/10: ladvise speed: 2.74568
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.12973
Iter 5/10: OSS cache speed: 4.84117
Iter 5/10: ladvise speed: 5.0324
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.29898
Iter 6/10: OSS cache speed: 3.85741
Iter 6/10: ladvise speed: 4.08119
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.02582
Iter 7/10: OSS cache speed: 4.49946
Iter 7/10: ladvise speed: 4.41134
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.28268
Iter 8/10: OSS cache speed: 3.09398
Iter 8/10: ladvise speed: 3.95447
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.62505
Iter 9/10: OSS cache speed: 4.53273
Iter 9/10: ladvise speed: 4.66001
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.8135
Iter 10/10: OSS cache speed: 3.79885
Iter 10/10: ladvise speed: 3.62744
Average uncached read: 3.23
Average speedup with OSS cached read:  3.10 = +-4.02%
Average speedup with ladvise willread:  3.60 = +11.45%
Speedup with OSS cached read less than 20%,  got 3.10%. Skipping ladvise willread check.