== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:47:21 (1751320041)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.601588 s, 174 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: 4.91193
Iter 1/10: OSS cache speed: 5.3742
Iter 1/10: ladvise speed: 3.68093
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.99425
Iter 2/10: OSS cache speed: 5.40774
Iter 2/10: ladvise speed: 5.52271
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.75041
Iter 3/10: OSS cache speed: 4.31755
Iter 3/10: ladvise speed: 4.72856
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.98531
Iter 4/10: OSS cache speed: 4.65056
Iter 4/10: ladvise speed: 4.62562
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.25285
Iter 5/10: OSS cache speed: 4.10731
Iter 5/10: ladvise speed: 4.91595
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.27601
Iter 6/10: OSS cache speed: 6.513
Iter 6/10: ladvise speed: 6.64564
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.50018
Iter 7/10: OSS cache speed: 5.66624
Iter 7/10: ladvise speed: 4.49212
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.12152
Iter 8/10: OSS cache speed: 3.39035
Iter 8/10: ladvise speed: 3.33296
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.01662
Iter 9/10: OSS cache speed: 4.54987
Iter 9/10: ladvise speed: 3.47443
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.09019
Iter 10/10: OSS cache speed: 4.10274
Iter 10/10: ladvise speed: 3.74196
Average uncached read: 3.98
Average speedup with OSS cached read:  4.80 = +20.60%
Average speedup with ladvise willread:  4.51 = +13.31%
Speedup with OSS cached read less than 20%,  got 4.80%. Skipping ladvise willread check.