From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Why the stack frame in perf.data isn't displayed in FlameGraph? Date: Thu, 18 May 2017 09:32:54 +0200 Message-ID: <9775568.X03CyG2sn6@agathebauer> References: Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart22318537.P1zgMq4Ugo"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:37526 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751548AbdERHc6 (ORCPT ); Thu, 18 May 2017 03:32:58 -0400 In-Reply-To: Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Nan Xiao Cc: linux-perf-users@vger.kernel.org --nextPart22318537.P1zgMq4Ugo Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Donnerstag, 18. Mai 2017 06:09:55 CEST Nan Xiao wrote: > Hi all, > > I am a newbie of using perf tools and FlameGraph. I write a simple > test program which is rafacimentoed from this > NTL(http://www.shoup.net/ntl/doc/tour-ex3.html) program: > > #include > > using namespace std; > using namespace NTL; > > void inner(int i, ZZX& t, Vec& phi) > { > for (long j = 1; j <= i-1; j++) > if (i % j == 0) > t *= phi(j); > } > > void outer(int i, Vec& phi) > { > ZZX t; > t = 1; > inner(i, t, phi); > phi(i) = (ZZX(INIT_MONO, i) - 1)/t; > cout << phi(i) << "\n"; > } > > int main() > { > Vec phi(INIT_SIZE, 100); > > for (long i = 1; i <= phi.length(); i++) { > outer(i, phi); > } > } > > And compile it using following command: > > g++ -pthread test.cpp -lntl -lgmp Frame pointers are missing, you probably want to use either a) `g++ -fno-omit-frame-pointers` which may work if NTL is header-only b) `g++ -g` to rely on dwarf debug information and then use `perf record -- call-graph dwarf` In general, I suggest to always compile with `-O2 -g` when you want to profile, otherwise you are missing a lot of compiler optimizations, and/or cripple tools like perf that want to use debug information. > I use "perf record -g ./a.out" to profile the program, but "perf > report" can only show "main" and "outer", no "inner" function > (https://github.com/NanXiao/images/blob/master/perf/perf.data): > > ...... > + 7.10% 0.00% a.out a.out [.] outer > + 7.10% 0.00% a.out a.out [.] main > ...... I bet that's because the "inner" function got inlined and frame pointers are disabled (see above). Recompile with the command above, and then use `perf record --call-graph dwarf`. Also, to see inline frames, try to build perf from git (acme's perf/core) and use `perf report --inline`. > From the > perf.svg(https://github.com/NanXiao/images/blob/master/perf/perf.svg), > there is neither "outer" nor "inner" stack frames. > > Since there is "outer" in perf.data, why it can't display in > FlameGraph? Another doubt is why perf.data doesn't contain "inner" > stack frame? If the above fixes it for report, try to apply "[PATCH] perf script: Add -- inline option" by Namhyung Kim. Then you can generate the flamegraph via perf script --inline | stackcollapse-perf.pl | flamegraph.pl > out.svg Which should also show the inline frames. Cheers, hope that helps -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart22318537.P1zgMq4Ugo Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt/caM+byAAQtOeBOW+0fvGwPzbX6I7bO3psRM5ek KUx9k5+9SryT7QMa44/P5W1QWtaXKZRagLBJetsulf24yr83OC0ePpFBrXBWx/BPP+gynnTKyJBU 6cZfD3idmkA8Dqxhql4Uj56HoWpQ3NeaTq8Fs6ZxlJxxs1BgCscTnTgHhgKo6ahpJhiQq0ywTyOr Ok+E2N/On+Fpb7vXQtdrROTHre5tQV9yWnEIN7N5ZaRZoJQ39wAvDcKSctrQOHLbFKhFxF0qfbe0 1sTurM0TRLfJK91DACX6YblpalgjEbenM49WdVn1zSnXRrcKK2W200JvFbK4e/vv6V1T1TRaJwID AQABo4HYMIHVMB8GA1UdIwQYMBaAFFMy0bPPf/rg8aBdhU6S0p5FHbRPMB0GA1UdDgQWBBStvZh6 NLQm9/rEJlTvA73gJMtUGjAOBgNVHQ8BAf8EBAMCAQYwDwYDVR0TAQH/BAUwAwEB/zARBglghkgB hvhCAQEEBAMCAQIwIAYDVR0lBBkwFwYKKwYBBAGCNwoDAwYJYIZIAYb4QgQBMD0GA1UdHwQ2MDQw MqAwoC6GLGh0dHA6Ly9jcmwudXNlcnRydXN0LmNvbS9VVE4tREFUQUNvcnBTR0MuY3JsMA0GCSqG SIb3DQEBBQUAA4IBAQDG7lMXaBSyUSIekFgNlP298XDlhi3DNjGPVEhG5y0IN7xsCmDhDq1RNOAS k+m+uKu4JrTplj0oj65kB/7gAezF45HrGKDxdX7bCuafkduvrnXfI5Fo3RcAWkv/ZGxw6wEa0JDZ x6bWbfYT5P+1ydIeKsuxJUMmeNkwm04NHr5p79/q/i2zzPmw3bUUypHUsrWl+wEZo0d5n52MlYc0 +B84kto2phH6a+tr6dxFeBU5BtdNQeQhyNwvh9G3v0hgdaViyyTeO2GgKSCmvsVsnMTpCmki75E6 +iav0VtBpzri+DgHQqvBW/jObboPBD8yNKzcBCjXcDAUJgbE5JuY1c94MIIEnTCCA4WgAwIBAgIQ ND3pK6wnNP+PyzSU+8xwVDANBgkqhkiG9w0BAQUFADBvMQswCQYDVQQGEwJTRTEUMBIGA1UEChML QWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVybmFsIFRUUCBOZXR3b3JrMSIwIAYD VQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MB4XDTA1MDYwNzA4MDkxMFoXDTIwMDUzMDEw NDgzOFowga4xCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENp dHkxHjAcBgNVBAoTFVRoZSBVU0VSVFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51 c2VydHJ1c3QuY29tMTYwNAYDVQQDEy1VVE4tVVNFUkZpcnN0LUNsaWVudCBBdXRoZW50aWNhdGlv biBhbmQgRW1haWwwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCyOYWk8n2rQTtiRjeu zcFgdbw5ZflKGkeiucxIzGqY1U01GbmkQuXOSeKKLx580jEHx060g2SdLinVomTEhb2FUTV5pE5o kHsceqSSqBfymBXyk8zJpDKVuwxPML2YoAuL5W4bokb6eLyib6tZXqUvz8rabaov66yhs2qqty5n NYt54R5piOLmRs2gpeq+C852OnoOm+r82idbPXMfIuZIYcZM82mxqC4bttQxICy8goqOpA6l14lD /BZarx1x1xFZ2rqHDa/68+HC8KTFZ4zW1lQ63gqkugN3s2XI/R7TdGKqGMpokx6hhX71R2XL+E1X KHTSNP8wtu72YjAUjCzrAgMBAAGjgfQwgfEwHwYDVR0jBBgwFoAUrb2YejS0Jvf6xCZU7wO94CTL VBowHQYDVR0OBBYEFImCZ33EnSZwAEu0UEh83j2uBG59MA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB Af8EBTADAQH/MBEGA1UdIAQKMAgwBgYEVR0gADBEBgNVHR8EPTA7MDmgN6A1hjNodHRwOi8vY3Js LnVzZXJ0cnVzdC5jb20vQWRkVHJ1c3RFeHRlcm5hbENBUm9vdC5jcmwwNQYIKwYBBQUHAQEEKTAn MCUGCCsGAQUFBzABhhlodHRwOi8vb2NzcC51c2VydHJ1c3QuY29tMA0GCSqGSIb3DQEBBQUAA4IB AQABvJzjYyiw8zEBwt973WKgAZ0jMQ+cknNTUeofTPrWn8TKL2d+eDMPdBa5kYeR9Yom+mRwANge +QsEYlCHk4HU2vUj2zS7hVa0cDRueIM3HoUcxREVkl+HF72sav3xwtHMiV+xfPA+UfI183zsYJhr Oivg79+zfYbrtRv1W+yifJgT1wBQudEtc94DeHThBYUxXsuauZ2UxrmUN3Vy3ET7Z+jw+iUeUqfa JelH4KDHPKBOsQo2+3dIn++Xivu0/uOUFKiDvFwtP9JgcWDuwnGCDOmINuPaILSjoGyqlku4gI51 ykkH9jsUut/cBdmf2+Cy5k2geCbn5y1uf1/GHogVMIIFGjCCBAKgAwIBAgIQbRnqpxlPajMi5iIy eqpx3jANBgkqhkiG9w0BAQUFADCBrjELMAkGA1UEBhMCVVMxCzAJBgNVBAgTAlVUMRcwFQYDVQQH Ew5TYWx0IExha2UgQ2l0eTEeMBwGA1UEChMVVGhlIFVTRVJUUlVTVCBOZXR3b3JrMSEwHwYDVQQL ExhodHRwOi8vd3d3LnVzZXJ0cnVzdC5jb20xNjA0BgNVBAMTLVVUTi1VU0VSRmlyc3QtQ2xpZW50 IEF1dGhlbnRpY2F0aW9uIGFuZCBFbWFpbDAeFw0xMTA0MjgwMDAwMDBaFw0yMDA1MzAxMDQ4Mzha MIGTMQswCQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdT YWxmb3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRlZDE5MDcGA1UEAxMwQ09NT0RPIENsaWVu dCBBdXRoZW50aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOC AQ8AMIIBCgKCAQEAkoSEW0tXmNReL4uk4UDIo1NYX2Zl8TJO958yfVXQeExVt0KU4PkncQfFxmmk uTLE8UAakMwnVmJ/F7Vxaa7lIBvky2NeYMqiQfZq4aP/uN8fSG1lQ4wqLitjOHffsReswtqCAtbU MmrUZ28gE49cNfrlVICv2HEKHTcKAlBTbJUdqRAUtJmVWRIx/wmi0kzcUtve4kABW0ho3cVKtODt JB86r3FfB+OsvxQ7sCVxaD30D9YXWEYVgTxoi4uDD216IVfmNLDbMn7jSuGlUnJkJpFOpZIP/+Cx YP0ab2hRmWONGoulzEKbm30iY9OpoPzOnpDfRBn0XFs1uhbzp5v/wQIDAQABo4IBSzCCAUcwHwYD VR0jBBgwFoAUiYJnfcSdJnAAS7RQSHzePa4Ebn0wHQYDVR0OBBYEFHoTTgB0W8Z4Y2QnwS/ioFu8 ecV7MA4GA1UdDwEB/wQEAwIBBjASBgNVHRMBAf8ECDAGAQH/AgEAMBEGA1UdIAQKMAgwBgYEVR0g ADBYBgNVHR8EUTBPME2gS6BJhkdodHRwOi8vY3JsLnVzZXJ0cnVzdC5jb20vVVROLVVTRVJGaXJz dC1DbGllbnRBdXRoZW50aWNhdGlvbmFuZEVtYWlsLmNybDB0BggrBgEFBQcBAQRoMGYwPQYIKwYB BQUHMAKGMWh0dHA6Ly9jcnQudXNlcnRydXN0LmNvbS9VVE5BZGRUcnVzdENsaWVudF9DQS5jcnQw JQYIKwYBBQUHMAGGGWh0dHA6Ly9vY3NwLnVzZXJ0cnVzdC5jb20wDQYJKoZIhvcNAQEFBQADggEB AIXWvnhXVW0zf0RS/kLVBqgBA4CK+w2y/Uq/9q9BSfUbWsXSrRtzbj7pJnzmTJjBMCjfy/tCPKEl Pgp11tA9OYZm0aGbtU2bb68obB2v5ep0WqjascDxdXovnrqTecr+4pEeVnSy+I3T4ENyG+2P/WA5 IEf7i686ZUg8mD2lJb+972DgSeUWyOs/Q4Pw4O4NwdPNM1+b0L1garM7/vrUyTo8H+2b/5tJM75C KTmD7jNpLoKdRU2oadqAGx490hpdfEeZpZsIbRKZhtZdVwcbpzC+S0lEuJB+ytF5OOu0M/qgOl0m WJ5hVRi0IdWZ1eBDQEIwvuql55TSsP7zdfl/bucwggZKMIIFMqADAgECAhByCOhbkTwXiJtaa0d5 K5u0MA0GCSqGSIb3DQEBBQUAMIGTMQswCQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5j aGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRlZDE5MDcG A1UEAxMwQ09NT0RPIENsaWVudCBBdXRoZW50aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMB4X DTE0MDYwMjAwMDAwMFoXDTE3MDYwMTIzNTk1OVowggFZMQswCQYDVQQGEwJTRTEPMA0GA1UEERMG NjgzIDMxMRIwEAYDVQQIEwlWYWVybWxhbmQxEDAOBgNVBAcTB0hhZ2ZvcnMxGDAWBgNVBAkTD05v cnJpbmdzIHZhZWcgMjEPMA0GA1UEEhMGQm94IDMwMSYwJAYDVQQKDB1LbGFyw6RsdmRhbGVucyBE YXRha29uc3VsdCBBQjEdMBsGA1UECxMUQSBLREFCIEdyb3VwIENvbXBhbnkxQzBBBgNVBAsMOklz c3VlZCB0aHJvdWdoIEtsYXLDpGx2ZGFsZW5zIERhdGFrb25zdWx0IEFCIEUtUEtJIE1hbmFnZXIx HzAdBgNVBAsTFkNvcnBvcmF0ZSBTZWN1cmUgRW1haWwxFTATBgNVBAMTDE1pbGlhbiBXb2xmZjEk MCIGCSqGSIb3DQEJARYVbWlsaWFuLndvbGZmQGtkYWIuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOC AQ8AMIIBCgKCAQEAwirYPAOcWQk9jaCoEAn84PwINg/NDs3PxsEd34f27AfCqJepwIF+ikMuBBxt mm1pieQwU9fcFrE4CXPCdYxfFOdcbJJ58Xzog5aFrJHnYGEFIL8KVvdBvAFeP/AJPaY2lg1JWnVI 1jwO74VmUGMyvMG286wpwW3hWO3sepZZQN3tvXyd9EgD72AiImkvw43+BW4xy8ptOd3TvEwCJ+uN x8v+uILsRLvKcmSrUsLpo7No2HoifWX1doKHKSwYVVqmOT/rjJWxF98j4w2kTKRsWdQ4ENlqNpjW zlbtB6TM2mrnInefzALbIoLLQ2E2NFCaMVsczf7RFsMxUepM9KQQ5QIDAQABo4IBzzCCAcswHwYD VR0jBBgwFoAUehNOAHRbxnhjZCfBL+KgW7x5xXswHQYDVR0OBBYEFGSjHixs9BD9OyGskYjMX7mi P+fiMA4GA1UdDwEB/wQEAwIFoDAMBgNVHRMBAf8EAjAAMB0GA1UdJQQWMBQGCCsGAQUFBwMEBggr BgEFBQcDAjBGBgNVHSAEPzA9MDsGDCsGAQQBsjEBAgEDBTArMCkGCCsGAQUFBwIBFh1odHRwczov L3NlY3VyZS5jb21vZG8ubmV0L0NQUzBXBgNVHR8EUDBOMEygSqBIhkZodHRwOi8vY3JsLmNvbW9k b2NhLmNvbS9DT01PRE9DbGllbnRBdXRoZW50aWNhdGlvbmFuZFNlY3VyZUVtYWlsQ0EuY3JsMIGI BggrBgEFBQcBAQR8MHowUgYIKwYBBQUHMAKGRmh0dHA6Ly9jcnQuY29tb2RvY2EuY29tL0NPTU9E T0NsaWVudEF1dGhlbnRpY2F0aW9uYW5kU2VjdXJlRW1haWxDQS5jcnQwJAYIKwYBBQUHMAGGGGh0 dHA6Ly9vY3NwLmNvbW9kb2NhLmNvbTAgBgNVHREEGTAXgRVtaWxpYW4ud29sZmZAa2RhYi5jb20w DQYJKoZIhvcNAQEFBQADggEBAFvi067uXCOkiUH/D6rv4gV0/e+e8DzcvbbsUxAC5nwDXBv+47ds l7j8NrZstZraVz35WEWgksNmnyghcuBKzKcN3kY1KNn/ERc9wvns/0dI+yj39L0eSMzchUZoV6GY MtPfmLofPvUBbDesl97JQXF9vpk8FIVsI1UKKrLzfoKhue5abQHXurSFa0ts1UPmSh2Y8/QCQlFN lCv8ISyEwVCAkhdIqxRc3hslooBhcRVUrYhRdCLlNN6Od8yuLE9sKWH/K4wg/BpnjCJmGp4GQhU8 DUG2r0CbOa+iZQKTWUgwdGU3Jr+WcOan/JaNzBuKk1GM3D+WcljoU7ZWtoqXPzgxggJaMIICVgIB ATCBqDCBkzELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UE BxMHU2FsZm9yZDEaMBgGA1UEChMRQ09NT0RPIENBIExpbWl0ZWQxOTA3BgNVBAMTMENPTU9ETyBD bGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQQIQcgjoW5E8F4ibWmtHeSub tDAJBgUrDgMCGgUAoIGHMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkFMQ8X DTE3MDUxODA3MzI1NFowIwYJKoZIhvcNAQkEMRYEFHqWlkjS0WevEcC5iYO1zDFEWO9QMCgGCSqG SIb3DQEJDzEbMBkwCwYJYIZIAWUDBAECMAoGCCqGSIb3DQMHMA0GCSqGSIb3DQEBAQUABIIBAGDg 6iOx0kDRzibJTq+j05zA1AhhBGqIKnqaKxsqwYDVgjIxjNudvt8Wi0aoq+BcSq0jJvQqoZFKfey6 sInsnY3rkA/YPZppctA4OCd3ICWxtgXEVKcAIYlGF1VMBrx9TccQ6i5hP0gmwt8o9F8XO+pAcIFh n0hIkIWdH63UzATcwE4JO16H1rSP+zAgadOto4tVT6mvrg0GmtyZgvGM/tHhHNMPgsT+p0vFIBbR gkgn6+zzThoQ2BPiTqer9ge1J6u9gD0tGmQyYGbwHGelFy8XBC03e9hiu4+PilAXj9Y890UPst50 KO8wjpNWLYiQWkcXZo7tUmlRmwhhKEE95WoAAAAAAAA= --nextPart22318537.P1zgMq4Ugo--