== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:54:21 (1721382861)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.467856 s, 224 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: 3.65443
Iter 1/10: OSS cache speed: 3.06547
Iter 1/10: ladvise speed: 2.87295
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.00455
Iter 2/10: OSS cache speed: 4.9695
Iter 2/10: ladvise speed: 3.92343
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.10573
Iter 3/10: OSS cache speed: 2.70516
Iter 3/10: ladvise speed: 2.76417
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.69634
Iter 4/10: OSS cache speed: 3.44208
Iter 4/10: ladvise speed: 3.14302
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.03063
Iter 5/10: OSS cache speed: 3.81213
Iter 5/10: ladvise speed: 4.70855
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.0261
Iter 6/10: OSS cache speed: 3.11867
Iter 6/10: ladvise speed: 2.69521
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.74796
Iter 7/10: OSS cache speed: 2.67203
Iter 7/10: ladvise speed: 3.01913
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.02786
Iter 8/10: OSS cache speed: 4.03861
Iter 8/10: ladvise speed: 4.82236
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.86926
Iter 9/10: OSS cache speed: 5.05544
Iter 9/10: ladvise speed: 5.11126
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.78764
Iter 10/10: OSS cache speed: 4.51704
Iter 10/10: ladvise speed: 4.50225
Average uncached read: 3.49
Average speedup with OSS cached read:  3.73 = +6.87%
Average speedup with ladvise willread:  3.75 = +7.44%
Speedup with OSS cached read less than 20%,  got 3.73%. Skipping ladvise willread check.