== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:08:02 (1718399282)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.35742 s, 77.2 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: 1.74408
Iter 1/10: OSS cache speed: 2.18977
Iter 1/10: ladvise speed: 2.28211
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.80492
Iter 2/10: OSS cache speed: 2.10525
Iter 2/10: ladvise speed: 2.608
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.91299
Iter 3/10: OSS cache speed: 6.06963
Iter 3/10: ladvise speed: 6.58607
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.06208
Iter 4/10: OSS cache speed: 7.46435
Iter 4/10: ladvise speed: 7.01429
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 6.31935
Iter 5/10: OSS cache speed: 7.40109
Iter 5/10: ladvise speed: 7.2617
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 6.33019
Iter 6/10: OSS cache speed: 7.79598
Iter 6/10: ladvise speed: 7.43425
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.17962
Iter 7/10: OSS cache speed: 6.85096
Iter 7/10: ladvise speed: 7.18997
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.97118
Iter 8/10: OSS cache speed: 7.05608
Iter 8/10: ladvise speed: 7.44741
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 6.23418
Iter 9/10: OSS cache speed: 7.03585
Iter 9/10: ladvise speed: 7.03851
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.79098
Iter 10/10: OSS cache speed: 6.74317
Iter 10/10: ladvise speed: 6.34901
Average uncached read: 4.93
Average speedup with OSS cached read:  6.07 = +23.12%
Average speedup with ladvise willread:  6.12 = +24.13%
Speedup with OSS cached read less than 20%,  got 6.07%. Skipping ladvise willread check.