== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:09:19 (1747400959)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.631217 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: 6.70314
Iter 1/10: OSS cache speed: 6.56096
Iter 1/10: ladvise speed: 6.42294
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.44218
Iter 2/10: OSS cache speed: 6.82316
Iter 2/10: ladvise speed: 7.38642
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.39313
Iter 3/10: OSS cache speed: 6.15621
Iter 3/10: ladvise speed: 5.93709
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.77255
Iter 4/10: OSS cache speed: 7.41579
Iter 4/10: ladvise speed: 7.74619
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.2902
Iter 5/10: OSS cache speed: 6.57826
Iter 5/10: ladvise speed: 7.15489
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 6.20004
Iter 6/10: OSS cache speed: 7.09194
Iter 6/10: ladvise speed: 7.14594
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.76124
Iter 7/10: OSS cache speed: 6.5478
Iter 7/10: ladvise speed: 6.92124
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 6.08126
Iter 8/10: OSS cache speed: 6.16886
Iter 8/10: ladvise speed: 6.15854
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.53469
Iter 9/10: OSS cache speed: 6.40965
Iter 9/10: ladvise speed: 5.8021
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 6.00823
Iter 10/10: OSS cache speed: 7.52633
Iter 10/10: ladvise speed: 6.71098
Average uncached read: 5.81
Average speedup with OSS cached read:  6.72 = +15.66%
Average speedup with ladvise willread:  6.73 = +15.83%
Speedup with OSS cached read less than 20%,  got 6.72%. Skipping ladvise willread check.