Running it with -lprofiler I get a different picture:
(pprof) top
Total: 2188 samples
1427 65.2% 65.2% 1427 65.2% _setlocale
173 7.9% 73.1% 173 7.9% 0x00000001058385f5
140 6.4% 79.5% 140 6.4% v8::internal::String::WriteToFlat
87 4.0% 83.5% 87 4.0% v8::internal::FreeListNode::set_size
58 2.7% 86.2% 58 2.7% 0x00007fffffe00b85
43 2.0% 88.1% 43 2.0% v8::String::WriteAscii
28 1.3% 89.4% 28 1.3% _telldir$INODE64$UNIX2003
25 1.1% 90.5% 25 1.1% _sha1_block_asm_data_order
21 1.0% 91.5% 21 1.0% v8::internal::Heap::IterateRSet
18 0.8% 92.3% 81 3.7% v8::internal::MoveElements
16 0.7% 93.1% 16 0.7% __vproc_grab_subset
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