== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:31:51 (1781256711)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 2.95309 s, 35.5 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: 0.494287
Iter 1/10: OSS cache speed: 0.540131
Iter 1/10: ladvise speed: 0.58244
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.639479
Iter 2/10: OSS cache speed: 0.618153
Iter 2/10: ladvise speed: 0.552639
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.675566
Iter 3/10: OSS cache speed: 0.575238
Iter 3/10: ladvise speed: 0.597925
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.571296
Iter 4/10: OSS cache speed: 0.571573
Iter 4/10: ladvise speed: 0.535646
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.560971
Iter 5/10: OSS cache speed: 0.562382
Iter 5/10: ladvise speed: 0.529212
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.577216
Iter 6/10: OSS cache speed: 0.706467
Iter 6/10: ladvise speed: 0.554245
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.701596
Iter 7/10: OSS cache speed: 0.536793
Iter 7/10: ladvise speed: 0.648263
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.581309
Iter 8/10: OSS cache speed: 0.443985
Iter 8/10: ladvise speed: 0.605954
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.679586
Iter 9/10: OSS cache speed: 0.557676
Iter 9/10: ladvise speed: 0.539548
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.633483
Iter 10/10: OSS cache speed: 0.638159
Iter 10/10: ladvise speed: 0.603305
Average uncached read: .61
Average speedup with OSS cached read:  .57 = +-6.55%
Average speedup with ladvise willread:  .57 = +-6.55%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21885:  |tĘ|U: < 20 : syntax error: operand expected (error token is "< 20 ")
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches