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  • cURL PHP Proper SSL between private servers with self-signed certificate

    - by PolishHurricane
    I originally had a connection between my 2 servers running with CURLOPT_SSL_VERIFYPEER set to "false" with no Common Name in the SSL cert to avoid errors. The following is the client code that connected to the server with the certificate: curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE); curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2); However, I recently changed this code (set it to true) and specified the computers certificate in PEM format. curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE); curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2); curl_setopt($ch,CURLOPT_CAINFO,getcwd().'/includes/hostcert/Hostname.crt'); This worked great on the local network from a test machine, as the certificate is signed with it's hostname for a CN. How can I setup the PHP code so it only trusts the hostname computer and maintains a secure connection. I'm well aware you can just set CURLOPT_SSL_VERIFYHOST to "0" or "1" and CURLOPT_SSL_VERIFYPEER to "false", but these are not valid solutions as they break the SSL security.

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  • Android:How to avoid XML verification failed error and Upgrading to 2.x SDK successfully?

    - by user187532
    Hi, I have setup for Android development with 1.5 SDK on Mac O.S X - Eclipse 3.5. I want to upgrade the SDK, so as i followed to choose Window-Android SDK and AVD Manager from Eclipse. But it throws error as follows: XML verification failed for https://dl-ssl.google.com/android/repository/repository.xml. Error: cvc-elt.1: Cannot find the declaration of element 'sdk:sdk- repository'. Failed to fetch URL I tried "http" instead of https, but still getting the same error. I don't know why such crap error comes. If i see Android website, http://developer.android.com/intl/zh-CN/sdk/index.html its confusing. Could someone guide me easily to update Android SDK to 2.x or later without uninstalling my current setup environment. Thanks. I appreciate your kind suggestions.

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  • MySQL cross table regular expression match

    - by Josef Sábl
    I have a web application and I am working on engine that analyzes referals. Now I have table with pageviews along with referes that looks something like this: pv_id referer ------------------------------------------------------------ 5531854534 http://www.google.com/search?ie=UTF-8... 8161876343 http://google.cn/search?search=human+rights 8468434831 http://search.yahoo.com/search;_... The second table contains sources definitions like: source regex ------------------------------------------------------------ Google ^https?:\/\/[^\/]*google\.([a-z]{2,4})(\/.*|)$ Yahoo ^https?:\/\/[^\/]*yahoo\.com(\/.*|)$ What I want is third table created by joinin these two: pv_id source ------------------------------------------------------------ 5531854534 Google 8161876343 Google 8468434831 Yahoo How to join these tables with regular expression?

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  • Django get_FOO_display and distinct()

    - by datakid
    I've seen answers to both halves of my question, but I can't work out how to marry the two. I have a book model, and a translatedBook model. The translatedBook has a langage set up as model choices in the usual way: LANGUAGES = ( (u'it', u'Italian'), (u'ja', u'Japanese'), (u'es', u'Spanish'), (u'zh-cn', u'Simplified Chinese'), (u'zh-tw', u'Traditional Chinese'), (u'fr', u'French'), (u'el', u'Greek'), (u'ar', u'Arabic'), (u'bg', u'Bulgarian'), (u'bn', u'Bengali'), etc I know that to get "Italian" I have to do translatedBook.get_language_display on a Book object. But how do I get a list of distinct languages in their long format? I've tried: lang_avail = TargetText.objects.values('language').distinct().order_by('language') lang_avail = TargetText.objects.distinct().order_by('language').values('language'). lang_avail = TargetText.objects.all().distinct('language').order_by('language') but I can't seem to get what I want - which is a list like: "English, Italian, Simplified Chinese, Spanish" The final lang_avail listed above didn't return the list of 5, it returned the list of 355 (ie, # of books) with multiple repeats....

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  • Vba to Access record Insert Issue

    - by raam
    I want to insert Values to access table by using VBA control is there is any simple way to do this. i try this code but it does not work properly if i run this code it give the error 'variable not set' can anyone help me. thanks in advance Private Sub CommandButton1_Click() Dim cn As ADODB.Connection Dim strSql As String Dim lngKt As Long Dim dbConnectStr As String Dim Catalog As Object Dim cnt As ADODB.Connection Dim dbPath As String Dim myRecordset As New ADODB.Recordset Dim SQL As String, SQL2 As String dbPath = "table.accdb" dbConnectStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & dbPath & ";" SQL = "INSERT INTO Jun_pre (ProductName,DESCRIPTION,SKU,MT,(mt),MRP,Remark,no_of_units_in_a_case) VALUES (""aa"",""bb"",""test"",""testUnit"",""1"",""2"",,""3"",,""4"");" With cnt .Open dbConnectStr 'some other string was there .Execute (SQL) .Close End With End Sub

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  • Losing DateTimeOffset precision when using C#

    - by Darvis Lombardo
    I have a SQL Server table with a CreatedDate field of type DateTimeOffset(2). A sample value which is in the table is 2010-03-01 15:18:58.57 -05:00 As an example, from within C# I retrieve this value like so: var cmd = new SqlCommand("SELECT CreatedDate FROM Entities WHERE EntityID = 2", cn); var da = new SqlDataAdapter(cmd); DataTable dt =new DataTable(); da.Fill(dt); And I look at the value: MessageBox.Show(dt.Rows[0][0].ToString()); The result is 2010-03-01 15:18:58 -05:00, which is missing the .57 that is stored in the database. If I look at dt.Rows[0][0] in the Watch window, I also do not see the .57, so it appears it has been truncated. Can someone shed some light on this? I need to use the date to match up with other records in the database and the .57 is needed. Thanks! Darvis

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  • Multlingual redirect

    - by israkir
    I want to ignore the post form in the django's internatonalization. I am using the django-multilingual app, so I have different fields for different languages in the db. I come up with this idea: For each language, from the index.html page, redirect to a different url (e.g. /en/ or /de/ or /zh/). And each view of this urls, set the session according to the language like this: def set_lang_en(request): request.session['django_language'] = 'en' render_to_response("home.html") def set_lang_zh(request): request.session['django_language'] = 'zh-cn' render_to_response("home.html") Interestingly, this does the job, but if i refresh the page again after redirection (home.html). Why it is like this? And how can solve this problem either in my direction or other one?

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  • adodb .FIND question

    - by every_answer_gets_a_point
    i am using excel to connect to a mysql database i am doing this: rs.Find "rowid='105'" If Not rs.EOF Then cn.Execute "delete from batchinfo where rowid='105'" and it works well however, i need to be able to match data on multiple columns for example like this: rs. find "rowid='105'" and "something='sometext'" and "somethingelse='moretext'" i need to know whether or not rs.find matched ALL of the data. how can i do this? according to this i can't: http://articles.techrepublic.com.com/5100-10878_11-1045830.html# however perhaps there's a way i can rs.execute "some select statement" can someone help with this? would this do the trick for me and then i would check EOF: rs.Filter "LastName='Adams' and FirstName='Lamont'"

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  • IE 8 Chinese encoding characters

    - by digitalbart
    Hello, I am unable to render Chinese characters in IE 8. I have researched this and I am aware of the meta tag to force compatibility mode. I am also aware of the language pack you can install. Finally I have seen that Microsoft actually forces IE7 compatibility mode on their Chinese website. http://www.microsoft.com/zh/cn/default.aspx I am wondering if anyone has any alternatives solutions to this problem. None them seem that appealing to me. I am using utf8 as my encoding and this problem only occurs in IE8. Thanks

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  • How to run an .exe application in another computer?

    - by ADAM
    I am working on a C# application in Visual Studio 2013. When I run the .exe file from my computer, the application runs very well and all the features work. When I tried to run the .exe on another computer, the database side doesn't work well and the connection with the database couldn't be opened. The SqlConnection is constructed as follows: SqlConnection cn = new SqlConnection("Data Source=ADAM-PC;Initial Catalog=integrationdatabase;Integrated Security=True" I don't know how to change the data source to make the connection with the database established in another computer. How can I solve this problem?

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  • MySQL with Java: Open connection only if possible

    - by emempe
    I'm running a database-heavy Java application on a cluster, using Connector/J 5.1.14. Therefore, I have up to 150 concurrent tasks accessing the same MySQL database. I get the following error: Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections This happens because the server can't handle so many connections. I can't change anything on the database server. So my question is: Can I check if a connection is possible BEFORE I actually connect to the database? Something like this (pseudo code): check database for open connection slots if (slot is free) { Connection cn = DriverManager.getConnection(url, username, password); } else { wait ... } Cheers

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  • QtWebkit and hasPendingEvents() always True

    - by Deorf
    Hello. I use project webkit2png (slightly appended) to take screenshots in Linux. On the server running the latest version QtWebkit and Python 2.6 On some sites (eg 118114.cn) problem and the application hangs forever. Debug shows that the problem in this code snippet: while self.__loading:    if timeout 0 and time.time() = cancelAt:       raise RuntimeError("Request timed out on %s" % url)    while QApplication.hasPendingEvents():       QCoreApplication.processEvents() Full version of the source code is available here (lines 270-275) Somehow Loading-event hangs and hasPendingEvents can not be False. Most of the screenshots are created normally, but sometimes due to some URL drops my app: ( Does anyone know how to solve this problem and why the event hangs?

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  • Is this an injection attempt or a normal request?

    - by CheeseConQueso
    In cPanel's Analog Stats statistics module, I've noticed countless requests to connect to the following example: /?x=19&y=15 The numbers are random, but its always setting x and y variables. Another category of mysterious requests: /?id=http://nic.bupt.edu.cn/media/j1.txt?? There are other attempts at injections in the request log that have straight sql written into them as well. Example: /jobs/jobinfo.php?id=-999.9 UNION ALL SELECT 1,(SELECT concat(0x7e,0x27,count(table_name),0x27,0x7e) FROM information_schema.tables WHERE table_schema=0x73636363726F6F745F7075626C6963),3,4,5,6,7,8,9,10,11,12,13-- It looks like they are all reaching a 404, but I'm still wondering about the intent behind these. I know this is vague, but maybe someone knows that this is normal while using cPanel & phpMyAdmin services. Also, there was a search box installed on the site which could be the reason. Any suggestions as to what all these are?

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  • Is there a way to shift the equation numbering one tab space from the right margin (shift towards le

    - by Murari
    I have been formatting my dissertation and one little problem is stucking me up. I used the following code to typeset an equation \begin{align} & R=\frac{P^2}{P+S'} \label{eqn:SCS}\\ &\mbox {where} \quad \mbox R = \mbox {Watershed Runoff} \notag\\ &\hspace{0.63in} \mbox P = \mbox{Rainfall} \notag\\ &\hspace{0.63in} \mbox S' = \mbox{Storage in the watershed $=\frac{1000}{CN}-10$ }\notag \end{align} My output requirement is such that: The equation should begin one tab space from the left margin The equation number should end at one tab space from the right margin With the above code, I have the equation begin at the right place but not the numbering. Any help will be extremely appreciated. Thanks MP

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  • How to check whether a mysql select statement result has a value or not in php?

    - by udaya
    I have a textbox UserName and a Check Availability button next to it..... I have checked the availability by passing UserName textbox value..... But it doesn't seem to work.... Here is what i am doing? echo $UserName = $_GET['CheckUsername']; $_SESSION['state'] = $State; $queryres = "SELECT dUser_name FROM tbl_login WHERE dUser_name='$UserName'"; $result = mysql_query($queryres,$cn) or die("Selection Query Failed !!!"); if($result==true) // this condition doesn't seem to work { echo "User Name Available"; } else { echo "Sorry user name taken"; }

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  • Help with Parameterizing SQL Query for C# with possible null values

    - by Jhonny D. Cano -Leftware-
    Hello, people. I need help with parameterizing this query. SELECT * FROM greatTable WHERE field1 = @field1 AND field2 = @field2 The user should be able to search for any of the 2 fields, and the user also should be able to search if the field2 has null values. var query = "theQuery"; var cm = new SqlCommand(cn, query); cm.AddParameter("@field1", "352515"); cm.AddParameter("@field2", DBNull.Value); // my DataTable here is having 0 records var dt = GetTable(cm);

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  • Insert values into dataset

    - by sudha.s
    Am using vb.net.Having dataset contain column name as phone .it contain set of phone number. i want to add 0 to each phone number and store it in another dataset. my code -------- cmd = New OracleCommand("select substr(PHONE,-10)as PHONE from reports.renewal_contact_t where run_date=to_date('" + TextBox1.Text + "','mm/dd/yyyy') and EXP_DATE =to_date('" + TextBox2.Text + "','mm/dd/yyyy') and region not in('TNP')", cn) ada = New OracleDataAdapter(cmd) ada.Fill(ds, "reports.renewal_contact_t ") Dim ds1 As New DataSet ds1 = ds.Clone() For Each q In ds.Tables(0).Rows phone = z + q("PHONE").ToString For Each q1 In ds1.Tables(0).Rows q1("PHONE") = phone Next Next my problem is am not getting values in ds1.Please help me to correct it.

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  • Java, How to Instance HttpCookie from a String, any convenient ways?

    - by user435657
    Hi all, I have got a cookie string from HTTP response header like the following line: name=value; path=/; domain=.g.cn; expire=... I can parse the above line to key-value pairs, and, also it's easy to set the name and value to HttpCookie instance as this pair comes the first. But how to set the other pairs since I don't know which set-method corresponds to the name of the next name-value pair. Traverse all possible keys a cookie may contian and call the matched set-method, like below snippet? if (key.equalsIgnoreCase("path")) cookie.setPath(value); else if (key.equalsIgnoreCase("domain")) cookie.setDomain(value); That's foolish, any convenient ways? Thanks in advance.

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  • Get machine name from Active Directory

    - by Stephen Murby
    I have performed an "LDAP://" query to get a list of computers within a specified OU, my issue is not being able to collect just the computer "name" or even "cn". DirectoryEntry toShutdown = new DirectoryEntry("LDAP://" + comboBox1.Text.ToString()); DirectorySearcher machineSearch = new DirectorySearcher(toShutdown); //machineSearch.Filter = "(objectCatergory=computer)"; machineSearch.Filter = "(objectClass=computer)"; machineSearch.SearchScope = SearchScope.Subtree; machineSearch.PropertiesToLoad.Add("name"); SearchResultCollection allMachinesCollected = machineSearch.FindAll(); Methods myMethods = new Methods(); string pcName; foreach (SearchResult oneMachine in allMachinesCollected) { //pcName = oneMachine.Properties.PropertyNames.ToString(); pcName = oneMachine.Properties["name"].ToString(); MessageBox.Show(pcName); } Help much appreciated.

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  • Failure retrieving contents of directory

    - by Bondye
    Currently I have a couple of websites. My problem is that if I login on 1 specific domain with any of my programs (using notepadd++, FileZilla and Netbeans) the program stops at the content listing. I had it correctly running, (I'm working on a project on this domain for more than a year now) and suddenly I broke it somehow. This only happens on 1 specific domain, all other domains (from other hosts) are working. My colleague (next to me with same ip address) is able to login on this domain. Notepadd++ says: Failure retrieving contents of directory Filezilla says: Failed to retrieve directory listing Netbean popups: Upload files on save failed. (Because I have the setting upload on save enabled.) What I tried: First I thought it's my firewall, I disabled firewall but no result. Also notice that all other domain are working. Maby a blacklist with my ip address? No my colleague has the same ip address. Could anyone help me on this? Notepad++ Log [NppFTP] Everything initialized -> TYPE I Connecting -> Quit 220 ProFTPD 1.3.3e Server ready. -> USER username 331 Password required for domain -> PASS *HIDDEN* 230 User username logged in -> TYPE A 200 Type set to A -> MODE S 200 Mode set to S -> STRU F 200 Structure set to F -> CWD /domains/domain.nl/ 250 CWD command successful Connected -> CWD /domains/domain.nl/ 250 CWD command successful -> PASV 227 Entering Passive Mode (194,247,31,xx,137,xx). -> LIST -al Failure retrieving contents of directory /domains/domain.nl/ Filezilla log Status: Verbinden met 194.247.xx.xx:21... Status: Verbinding aangemaakt, welkomstbericht afwachten... Antwoord: 220 ProFTPD 1.3.3e Server ready. Commando: USER username Antwoord: 331 Password required for username Commando: PASS ******** Antwoord: 230 User username logged in Commando: SYST Antwoord: 215 UNIX Type: L8 Commando: FEAT Antwoord: 211-Features: Antwoord: MDTM Antwoord: MFMT Antwoord: LANG en-US;ja-JP;zh-TW;it-IT;fr-FR;zh-CN;ru-RU;bg-BG;ko-KR Antwoord: TVFS Antwoord: UTF8 Antwoord: AUTH TLS Antwoord: MFF modify;UNIX.group;UNIX.mode; Antwoord: MLST modify*;perm*;size*;type*;unique*;UNIX.group*;UNIX.mode*;UNIX.owner*; Antwoord: PBSZ Antwoord: PROT Antwoord: REST STREAM Antwoord: SIZE Antwoord: 211 End Commando: OPTS UTF8 ON Antwoord: 200 UTF8 set to on Status: Verbonden Status: Mappenlijst ophalen... Commando: PWD Antwoord: 257 "/" is the current directory Commando: TYPE I Antwoord: 200 Type set to I Commando: PASV Antwoord: 227 Entering Passive Mode (194,247,31,xx,xxx,xx). Commando: MLSD Fout: Verbinding verloren Fout: Ontvangen van mappenlijst is mislukt Sorry that it's dutch.

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  • 10 PowerShell One Liners

    - by BizTalk Visionary
    Here are a few one-liners that use NetCmdlets. Some of these I've blogged about before, some are new. Let me know if you have questions, which ones you find useful, or how you altered these to suit your own needs. Send email to a list of recipient addresses: import-csv users.csv | % { send-email -to $_.email -from [email protected] -subject "Important Email" –message "Hello World!" -server 10.0.1.1 } Show the access control list for a specific Exchange folder: get-imap -server $mymailserver -cred $mycred -folder INBOX.RESUMES –acl Add look and read permissions on an Exchange folder, for a list of accounts pulled from a CSV file: import-csv users.csv | % { set-imap -server -acluser $_.username $mymailserver -cred $mycred -folder INBOX.RESUMES –acl “lr”  } Sync system time with an Internet time server: get-time -server clock.psu.edu –set To remotely sync the time on a set of computers: import-csv computers.csv | % { Invoke-Command -computerName $_.computer -cred $mycred -scriptblock { get-time -server clock.psu.edu –set } } Delete all emails from an Exchange folder that match a certain criteria.  For example, delete all emails from [email protected]: get-imap -server $mailserver –cred $mycred | ? {$_.FromEmail -eq [email protected]} | %{ set-imap -server $mailserver –cred $mycred-message $_.Id -delete } Update Twitter status from PowerShell: get-http –url "http://twitter.com/statuses/update.xml" –cred $mycred -variablename status -variablevalue "Tweeting with NetCmdlets!" A test-path that works over FTP, FTPS (SSL), and SFTP (SSH) connections: get-ftp -server $remoteserver –cred $mycred -path /remote/path/to/checkfor* Don't forget the *.  Also, to use SSL or SSH just add an –ssl or –ssh parameter. List disabled user accounts in Active Directory (or any other LDAP server): get-ldap -server $ad -cred $mycred -dn dc=yourdc -searchscope wholesubtree     -search "(&(objectclass=user)(objectclass=person)(company=*)(userAccountControl:1.2.840.113556.1.4.803:=2))" List Active Directory groups and their members: get-ldap -server testman -cred $mycred -dn dc=NS2 -searchscope wholesubtree -search "(&(objectclass=group)(cn=*admin*))" | select ResultDN, member Display the last initialization time (e.g. last reboot time) of all discoverable SNMP agents on a network: import-csv computers.csv | % { get-snmp -agent $_.computer -oid sysUpTime.0 | %{([datetime]::Now).AddSeconds(-($_.OIDValue/100))} } Not mentioned here:  data conversion (Yenc, QP, UUencoding, MD5, SHA1, base64, etc), DNS, News Groups (NNTP/UseNet), POP mail, RSS feeds, Amazon S3, Syslog, TFTP, TraceRoute, SNMP Traps, UDP, WebDAV, whois, Rexec/Rshell/Telnet, Zip files, sending IMs (Jabber/GoogleTalk/XMPP), sending text messages and pages, ping, and more. Original Source: Lance's Textbox

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  • Full disk encryption with seperate boot and encrypted keyfile storage: Two-Form Authentication

    - by Cain
    I am trying to setup true Full Disk encryption with two-form authentication on 12.04 and can not find out how to call a keyfile for the encrypted root out of another encrypted partition. All documentation or questions I am finding for whole or full disk encryption only encrypts separate partitions on the same disk. This is not what most are calling full disk encryption, /boot is not on a partition on the root drive, rather it is on a usb stick as sdx1. Instead root is on a logical partition on top of a LUKS container. Luks is run on the whole disk, encrypting the partition table as well. All drives in the machine are completely encrypted and to open it it requires a USB drive (what I have) as well as a passphrase (what I know) resulting in Two-Form Authentication to boot the machine. Device sdx cryptroot vg00 lvroot / There is no passphrase to open the encrypted root device, only a keyfile. That keyfile is kept on the usb drive with /boot, in its own encrypted partition (I'll call this cryptkey). In order for the root file system (cryptroot) to be opened, initramfs must ask for the passphrase to cryptkey on the usb drive, then use the keyfile inside that to open cryproot. I did manage to find what I think is the how-to I used to do this once before: http://wiki.ubuntu.org.cn/UbuntuHelp:FeistyLUKSTwoFormFactor I already have the system installed and can chroot into it, however, I can not get it to call for the keys on the USB during boot. I did find a how-to saying I needed to make a cryptroot conf for initramfs but, I believe that is for a passphrase: https://help.ubuntu.com/community/EncryptedFilesystemLVMHowto#Notes_for_making_it_work_in_Ubuntu_12.04_.22Precise_Pangolin.22_amd64 I also tried to setup crypttab. However, crypttab only works for drives mounted after the root drive as calling for a keyfile on a device not yet mounted to the system doesnt work. The Feisty how-to included scripts that would be run during boot instructing initramfs to mount the usb drive temporarily and call the keyfile for root which worked quite well except those scripts are outdated now, many of the things they relied on have been merged into something else, changed, or simply don't exist anymore. If I have missed a clear how-to for this, that would be wonderful, I just don't think I have.

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  • Exchange 2010, Exchange 2003 Mail Flow issue

    - by Ryan Roussel
    While performing the initial Exchange 2010 deployment for a customer migrating from Exchange 2003, I ran into an issue with mail flow between the two environments.  The Exchange 2003 mailboxes could send to Exchange 2010, as well as to and from the internet.  Exchange 2010 mailboxes could send and receive to the internet, however they could not send to Exchange 2003 mailboxes.   After scouring the internet for a solution, it seemed quite a few people were experiencing this issue with no resolution to be found, or at least not easily.  After many attempts of manually deleting and recreating the routing group connectors,  I finally lucked onto the answer in an obscure comment left to another blogger.   If inheritable permissions are not allowed on the Exchange 2003 object in the Active Directory schema, exchange server authentication cannot be achieved between the servers.   It seems when Blackberry Enterprise Server gets added to 2003 environments, a lot of Admins get tricky and add the BES Admin user explicitly to the server object  to allow  inheritance down from there to all mailboxes.  The problem is they also coincidently turn off inheritance to the server object itself from its parent containers.  You can re-establish inheritance without overwriting the existing ACL however so that the BES Admin can remain in the server object ACL.   By re-establishing inheritance to the 2003 server object, mail flow was instantly restored between the servers.    To re-establish inheritance: 1. Open ASDIedit by adding the snap-in to a MMC (should be included on your 2008 server where Exchange 2010 is installed) 2. Navigate to Configuration > Services > Microsoft Exchange > Exchange Organization > Administrative Groups > First Administrative Group > Servers 3. In the right pane, right click on the CN=Server Name of your Exchange 2003 Server, select properties 4. Navigate to the Security tab, hit advanced toward the bottom. 5. Check the checkbox that reads “include inheritable permissions” toward the bottom of the dialogue box.

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  • C-states and P-states : confounding factors for benchmarking

    - by Dave
    I was recently looking into a performance issue in the java.util.concurrent (JUC) fork-join pool framework related to particularly long latencies when trying to wake (unpark) threads in the pool. Eventually I tracked the issue down to the power & scaling governor and idle-state policies on x86. Briefly, P-states refer to the set of clock rates (speeds) at which a processor can run. C-states reflect the possible idle states. The deeper the C-state (higher numerical values) the less power the processor will draw, but the longer it takes the processor to respond and exit that sleep state on the next idle to non-idle transition. In some cases the latency can be worse than 100 microseconds. C0 is normal execution state, and P0 is "full speed" with higher Pn values reflecting reduced clock rates. C-states are P-states are orthogonal, although P-states only have meaning at C0. You could also think of the states as occupying a spectrum as follows : P0, P1, P2, Pn, C1, C2, ... Cn, where all the P-states are at C0. Our fork-join framework was calling unpark() to wake a thread from the pool, and that thread was being dispatched onto a processor at deep C-state, so we were observing rather impressive latencies between the time of the unpark and the time the thread actually resumed and was able to accept work. (I originally thought we were seeing situations where the wakee was preempting the waker, but that wasn't the case. I'll save that topic for a future blog entry). It's also worth pointing out that higher P-state values draw less power and there's usually some latency in ramping up the clock (P-states) in response to offered load. The issue of C-states and P-states isn't new and has been described at length elsewhere, but it may be new to Java programmers, adding a new confounding factor to benchmarking methodologies and procedures. To get stable results I'd recommend running at C0 and P0, particularly for server-side applications. As appropriate, disabling "turbo" mode may also be prudent. But it also makes sense to run with the system defaults to understand if your application exhibits any performance sensitivity to power management policies. The operating system power management sub-system typically control the P-state and C-states based on current and recent load. The scaling governor manages P-states. Operating systems often use adaptive policies that try to avoid deep C-states for some period if recent deep idle episodes proved to be very short and futile. This helps make the system more responsive under bursty or otherwise irregular load. But it also means the system is stateful and exhibits a memory effect, which can further complicate benchmarking. Forcing C0 + P0 should avoid this issue.

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  • Oracle ?????????(??)

    - by Steve He(???)
    ??????,????????? ??IT ?????????????????????????; ????????????????????????; ????Oracle ??????????????????. Oracle ??????????????????????Oracle ???????,????Oracle ?????????,???????????,???????????????????,???????????????,???IT??????? ??????12 ?11 ??Oracle ?????Oracle ?????????! ??Oracle ??????????????Oracle ????(E-Business Suite)????????. ??????:????,IT ??,??????,???????Oracle ???????????. ????1. Oracle ??????????????2. My Oracle Support (MOS)?????????3. Oracle ?????????4. ??????????5. EBS????????????6. ???????????7. Q & A ????: 2012? 12? 11 ?(??) 09:30-17:00????:??????????????? 801-803 ?Oracle ??8006 ???????: ?????????????12 ?2 ????: [email protected] Normal 0 7.8 ? 0 2 false false false EN-US ZH-CN X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:????; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:??; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;} ?? ?? ?? ?? ?? ????:0755-86607226 ???:????? ?????: ????????????????????????????????

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