== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:48:21 (1778536101)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.665632 s, 158 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: 4.2796
Iter 1/10: OSS cache speed: 4.47091
Iter 1/10: ladvise speed: 4.23111
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.23631
Iter 2/10: OSS cache speed: 4.46481
Iter 2/10: ladvise speed: 4.38524
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.48769
Iter 3/10: OSS cache speed: 4.56834
Iter 3/10: ladvise speed: 4.89519
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.56054
Iter 4/10: OSS cache speed: 1.21275
Iter 4/10: ladvise speed: 0.696858
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.81979
Iter 5/10: OSS cache speed: 0.869296
Iter 5/10: ladvise speed: 0.838141
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.811411
Iter 6/10: OSS cache speed: 0.846632
Iter 6/10: ladvise speed: 0.789909
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.75377
Iter 7/10: OSS cache speed: 0.792477
Iter 7/10: ladvise speed: 0.861619
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.974426
Iter 8/10: OSS cache speed: 0.937831
Iter 8/10: ladvise speed: 0.928276
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.99072
Iter 9/10: OSS cache speed: 1.13156
Iter 9/10: ladvise speed: 1.14488
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.24623
Iter 10/10: OSS cache speed: 1.2758
Iter 10/10: ladvise speed: 1.18186
Average uncached read: 2.21
Average speedup with OSS cached read:  2.05 = +-7.23%
Average speedup with ladvise willread:  1.99 = +-9.95%
Speedup with OSS cached read less than 20%,  got 2.05%. Skipping ladvise willread check.