== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:41:56 (1736264516)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.581031 s, 180 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: 4.47493
Iter 1/10: OSS cache speed: 4.81214
Iter 1/10: ladvise speed: 4.65806
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.73809
Iter 2/10: OSS cache speed: 4.62825
Iter 2/10: ladvise speed: 4.73441
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.63075
Iter 3/10: OSS cache speed: 4.56818
Iter 3/10: ladvise speed: 4.6383
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.72649
Iter 4/10: OSS cache speed: 4.61284
Iter 4/10: ladvise speed: 4.74977
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.71688
Iter 5/10: OSS cache speed: 4.1597
Iter 5/10: ladvise speed: 4.55327
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.12918
Iter 6/10: OSS cache speed: 4.55292
Iter 6/10: ladvise speed: 4.64184
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.69234
Iter 7/10: OSS cache speed: 4.72671
Iter 7/10: ladvise speed: 4.34456
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.8499
Iter 8/10: OSS cache speed: 4.86114
Iter 8/10: ladvise speed: 4.74701
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.64913
Iter 9/10: OSS cache speed: 4.39903
Iter 9/10: ladvise speed: 4.5671
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.72555
Iter 10/10: OSS cache speed: 4.65479
Iter 10/10: ladvise speed: 4.48447
Average uncached read: 4.63
Average speedup with OSS cached read:  4.59 = +-.86%
Average speedup with ladvise willread:  4.61 = +-.43%
Speedup with OSS cached read less than 20%,  got 4.59%. Skipping ladvise willread check.