== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:27:08 (1736983628)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.721285 s, 145 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: 2.52419
Iter 1/10: OSS cache speed: 2.62141
Iter 1/10: ladvise speed: 2.9374
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.38846
Iter 2/10: OSS cache speed: 2.61007
Iter 2/10: ladvise speed: 2.90332
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.33903
Iter 3/10: OSS cache speed: 3.51465
Iter 3/10: ladvise speed: 3.02633
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.98678
Iter 4/10: OSS cache speed: 2.54959
Iter 4/10: ladvise speed: 2.73563
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.91094
Iter 5/10: OSS cache speed: 2.78418
Iter 5/10: ladvise speed: 2.78727
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.50147
Iter 6/10: OSS cache speed: 3.11555
Iter 6/10: ladvise speed: 3.20755
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.4456
Iter 7/10: OSS cache speed: 3.12621
Iter 7/10: ladvise speed: 3.27033
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.33459
Iter 8/10: OSS cache speed: 1.81405
Iter 8/10: ladvise speed: 2.02793
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.63963
Iter 9/10: OSS cache speed: 2.96378
Iter 9/10: ladvise speed: 2.36641
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.41325
Iter 10/10: OSS cache speed: 2.78795
Iter 10/10: ladvise speed: 2.57464
Average uncached read: 2.94
Average speedup with OSS cached read:  2.78 = +-5.44%
Average speedup with ladvise willread:  2.78 = +-5.44%
Speedup with OSS cached read less than 20%,  got 2.78%. Skipping ladvise willread check.