== sanity test 255a: check 'lfs ladvise -a willread' ===== 02:36:48 (1713508608)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.647553 s, 162 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: 4.89123
Iter 1/10: OSS cache speed: 7.05187
Iter 1/10: ladvise speed: 6.8639
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.77788
Iter 2/10: OSS cache speed: 6.82467
Iter 2/10: ladvise speed: 7.2487
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 6.30521
Iter 3/10: OSS cache speed: 5.79881
Iter 3/10: ladvise speed: 5.71244
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.12723
Iter 4/10: OSS cache speed: 6.5273
Iter 4/10: ladvise speed: 7.11204
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.11462
Iter 5/10: OSS cache speed: 6.31874
Iter 5/10: ladvise speed: 6.95257
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.76721
Iter 6/10: OSS cache speed: 6.72474
Iter 6/10: ladvise speed: 6.90305
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.09148
Iter 7/10: OSS cache speed: 6.06843
Iter 7/10: ladvise speed: 5.30764
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.07113
Iter 8/10: OSS cache speed: 6.5149
Iter 8/10: ladvise speed: 6.32457
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.59081
Iter 9/10: OSS cache speed: 4.29281
Iter 9/10: ladvise speed: 3.44472
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.72903
Iter 10/10: OSS cache speed: 4.82742
Iter 10/10: ladvise speed: 3.73224
Average uncached read: 5.14
Average speedup with OSS cached read:  6.09 = +18.48%
Average speedup with ladvise willread:  5.96 = +15.95%
Speedup with OSS cached read less than 20%,  got 6.09%. Skipping ladvise willread check.