我是spark的新手，正在尝试在我的hadoop节点centos7上运行spark，它位于vmware上：2gb ram、20gb磁盘、1cpu
我收到此错误消息：

[root@xie1 spark]# bin/spark-shell
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 716177408, 0) failed; error='Cannot allocate memory' (errno=12)

# 

# There is insufficient memory for the Java Runtime Environment to continue.

# Native memory allocation (mmap) failed to map 716177408 bytes for committing reserved memory.

# An error report file with more information is saved as:

# /opt/spark/hs_err_pid79417.log

在谷歌搜索之后，我查看了下面的mem：

[root@xie1 spark]# cat /proc/meminfo
MemTotal:        1868688 kB
MemFree:           76428 kB
MemAvailable:      80840 kB
Buffers:              68 kB
Cached:            92172 kB
SwapCached:       189260 kB
Active:          1158888 kB
Inactive:         426036 kB
Active(anon):    1108308 kB
Inactive(anon):   389960 kB
Active(file):      50580 kB
Inactive(file):    36076 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       2097148 kB
SwapFree:         282684 kB
Dirty:                76 kB
Writeback:             0 kB
AnonPages:       1303360 kB
Mapped:            42176 kB
Shmem:              5596 kB
Slab:              95580 kB
SReclaimable:      34792 kB
SUnreclaim:        60788 kB
KernelStack:       19616 kB
PageTables:        32960 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     3031492 kB
Committed_AS:    6290644 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      173440 kB
VmallocChunk:   34359561216 kB
HardwareCorrupted:     0 kB
AnonHugePages:    319488 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      102272 kB
DirectMap2M:     1994752 kB
DirectMap1G:           0 kB

“vmalloctotal:34359738367kb”的含义是什么？它超出了我分配给vm的磁盘大小20g。vmalloctotal在哪些方面可以调整？我猜spark需要更多的资源，基于我目前分配的vm，我能做什么？怎么做呢？
非常感谢你。